"A strong body is necessary to enjoy a long life, I spent my youth training my body to the utmost possible. I became really tough because of that. Even in this ripe old age."
― Honest (Akame Ga Kill)
" Sokka, you must continue your training on your own. If you stay on this path, I know that one day, you will become an even greater master than I am."
― Piandao (Avatar: The Last Airbender))
"If [the law-ninjas] were dead, how did they know when to deploy? Hell, how have they been following us? They are exceptionally well trained."
― Black Mage and Thief (8-Bit Theater)
"So Wayne, how'd you learn all those cool self-defense moves?"
"I had training. Special training. The kind they're not allowed to give anymore."
― Bart Simpson and Wayne Slater (The Simpsons)
"My strength comes from training, not from some curse in my blood."
― Ryu Hayabusa (Ninja Gaiden)
"He put rookies through Hell and back. He trained them to perfection."
― Kyle Rayner on Kilowog's training regime (DC Comics)
"With practice comes mastery. With mastery comes understanding. With understanding comes perfection."
― Davos (Marvel Cinematic Universe)
"Not bad, but not enough. Be it training, strategy or resolution, everything is not enough! I will show you real strength that has been completely trained!!!"
― Douglas Bullet (One Piece: Stampede)
"Your Semblance is like a muscle. The more you practice with it, the stronger it will become. But if you only focus on one aspect of it...if you fail to test the limits of what you think is possible...then you'll never truly grow."
― Winter Schnee (RWBY)
"You used money to buy an insufficient talent. I used training and the glory of my life to make up for my lack of talent. That is it."
The user has developed incredible abilities by/through an extensive/excessive training regimen. Originally beginning as an individual with few or no special powers, engaging in specialized exercises (physical, mental, spiritual, etc.), allows the trainee to develop enhanced, potentially supernatural skills and techniques. Based on the nature of the training, continued practice can lead one to the greatest levels of one's desired discipline.
In several cases, the user possesses natural talent and special powers, but train themselves regardless in order to hone their skills and reach their full potential.
Vandalieu (The Death Mage Who Doesn’t Want a Fourth Time)
Kyōma Mabuchi (Dimension W)
Various Characters (Dragon Ball series)
Hokuto Shinken Practitioners (Fist of the North Star)
Haulia Tribe (From Common Job Class to Strongest In The World)
Gabimaru (Hell’s Paradise: Jigokuraku)
Walter C. Dornez (Hellsing)
Various Characters (Highschool DxD)
Various Characters (History's Mightiest Disciple Kenichi)
Various Characters (Legend of the Northern Blade)
Arel (The Jobless Hero: I Didn't need Skills Anyway)
Jonathan Joestar (JoJo's Bizarre Adventure)
Joseph Joestar (JoJo's Bizarre Adventure)
Caesar Zeppeli (JoJo's Bizarre Adventure Part II: Battle Tendency)
Jean Pierre Polnareff (JoJo's Bizarre Adventure Part III: Stardust Crusaders)
Various Characters (Kingdom)
Various Characters (Marchen Awakens Romance)
Various Characters (One Piece)
Saitama (One-Punch Man)
Ranma Saotome (Ranma 1/2)
Various Characters (Rurouni Kenshin)
Elline (Sekai no Owari no Encore)
Sung Jin-Woo (Solo Leveling)
Seran Leila (Tsuyokute New Saga)
Sasaki Kojiro (TYPE-MOON)
Genkai (Yu Yu Hakusho)
Yusuke Urameshi (Yu Yu Hakusho)
Shinobu Sensui (Yu Yu Hakusho)
Various Characters (Zatch Bell!)
Hayley Smith (American Dad!)
Danny Fenton/Phantom (Danny Phantom)
Jack (Samurai Jack)
Daughters of Aku (Samurai Jack)
Chase Young (Xiaolin Showdown)
Bane (DC Comics)
Batman Family (DC Comics)
Selena Kyle/Catwoman (DC Comics)
Green Lantern Corps (DC Comics)
Kal-El/Superman (DC Comics)
Karate Kid (DC Comics)
The Avengers (Marvel Comics)
Felicia Hardy/Black Cat (Marvel Comics)
Daniel Rand/Iron Fist (Marvel Comics)
James "Bucky" Barnes/Winter Soldier (Marvel Comics)
Jigsaw (Marvel Comics)
Karnak (Marvel Comics)
Killmonger (Marvel Comics)
Michael Van Patrick/MVP (Marvel Comics)
Natasha Romanoff/Black Widow (Marvel Comics)
Peter Parker/Spider-Man (Marvel Comics)
Shang-Chi (Marvel Comics)
T'Challa/Black Panther (Marvel Comics)
The X-Men (Marvel Comics)
Luther Strode (The Strange Talent of Luther Strode)
Ninja Turtles (Teenage Mutant Ninja Turtles)
Splinter (Teenage Mutant Ninja Turtles)
Various Characters (Usagi Yojimbo)
Charles Gunn (Angel)
Various Characters (Arrowverse)
Laurel Lance/Black Canary
Oliver Queen/Green Arrow
Sara Lance/Canary/White Canary
Buffy Summers (Buffy the Vampire Slayer)
Various Power Ranger Teams (Power Rangers franchise)
Various Super Sentai Ranger Teams (Super Sentai franchise)
Dean Winchester (Supernatural)
John Winchester (Supernatural)
Sam Winchester (Supernatural)
Xena (Xena: Warrior Princess)
Ezio Auditore da Firenze (Assassin's Creed)
Ratonhnhaké:ton (Assassin's Creed)
Lady (Devil May Cry)
Various characters (Dead or Alive/Ninja Gaiden)
Cloud Strife (Final Fantasy series)
Zod (Injustice: Gods Among Us)
Kratos (God of War series)
Link (The Legend of Zelda series)
Spyro (The Legend of Spyro)
Many characters (Metal Gear series)
Samus Aran (Metroid)
King Dedede (Kirby series)
Many characters (Resident Evil series)
Segata Sanshiro (Sega)
Many characters (Street Fighter series)
Many characters (Tekken series)
Freelancers (Red vs Blue)
Agent Maine/The Meta
Agent New York
Agent North Dakota
Agent South Dakota
Various characters (RWBY)
Various characters ("Bleach")
Various characters ("My Hero Academia")
In order to attain longevity, Honest (Akame Ga Kill!) has rigorously trained his body to complete perfection...
...gaining immense strength and fighting skills to single-handedly overpower a Teigu user.
Having been trained as a mercenary since age six, Guts (Berserk) possesses incredible physical capabilities, able to easily wield a massive 400-lb sword with one arm, move faster than the eye can see, and survive wounds that would be fatal to a normal man.
The Vizards (Bleach) underwent hard training to fully control their newfound Hollow powers after being forcefully modified into Hollow Hybrids.
As she largely suppresses her Chiropteran powers and refrains from feeding, Saya Otonashi's (Blood+) strength in a battle largely comes from extensive training in swordplay...
...and athletic activities like high-jumping.
Ikki Kurogane (Chivalry of a Failed Knight) has rigorously trained his body to uttermost perfection to make up for his lack of magical capacity,...
...allowing him such feats as removing his physical limiters to fight at full strength.
Even without his Contractor powers, Hei (Darker than Black) has trained to be a master martial artist at peak human condition.
Master Muten Rōshi (Dragon Ball series) achieved superhuman status through training, to the extent that he was once hailed the strongest man in the world.
While initially one of the weakest Saiyans to be born, Son Goku (Dragon Ball series) has attained power beyond that of even the gods themselves through constant training...
...first by learning the basics of martial arts by his Grandpa Gohan...
...then by learning to break through his limitations and push his body to superhuman levels with Master Muten Roshi's Kame-Sennin Ryu...
...opponent anticipation from Korin, the Sage of Korin Tower...
...precision, and the Bukūjutsuki/Dancing Sky Art from Mr. Popo and Kami...
...and ki training...
...with North/King Kai's Kaio-ken and Spirit Bomb/Genki-dama.
Z-Fighters (Dragon Ball Series)
Though nowhere near the Z-Fighters' level, Mr. Satan/Hercule (Dragon Ball series) is nonetheless more powerful than an ordinary human thanks to his training, able to pull off such feats as moving faster than the eye can see, pulling a line of four buses several feet with his bare hands, and surviving hits from Perfect Cell and Kid Buu.
Through four months of rigorous training, Frieza (Dragon Ball Super) became the first of his kind to awaken the Ultimate Evolution.
Once fairly weak, Jiren (Dragon Ball Super) trained himself extensively, eventually becoming so powerful that not even a God of Destruction could defeat him.
Even without his Devil Fruit powers, Monkey D. Luffy (One Piece) possesses incredible strength...
...and hand to hand combat skill as a result of the hellish training regimen his grandfather, Garp put him through as a child.
Through years of rigorous training regimen since childhood, which consists mainly of grueling bodybuilding exercises in addition to hard training in swordsmanship, Roronoa Zoro (One Piece) has...
...immense superhuman physical prowess, training daily with his oversized weights...
...agility, demonstrating with his Streaming Wolf Swords technique...
Due to years of extremely hard training under chef Zeff since childhood, Sanji (One Piece) gained...
...extraordinary superhuman physical prowess...
..speed and agility...
...which enables him to use an array of handstands for Zeff's versatile Black Leg Style, a powerful kick-based martial art.
After two years of extremely rigorous training, the Straw Hat Pirates (One Piece) became tremendously powerful, being able to survive the extreme dangers of the New World...
...defeating and holding their own against a large number of powerful Marine soldiers...
...and the powerful armies of the Four Emperors/Yonko.
Saitama (One-Punch Man) broke through his human limitations and achieved unbelievable strength and abilities considered impossible through an extensive training regimen.
Since childhood, Ou Hon (Kingdom) was trained and taught from the foundation up in the orthodox style of spear techniques,...
...and while he already possessed inner talent, he took his training seriously as he would practice till his palms bled or subject himself to the brutal cold of winter due to a chance encounter with his afloat father, Ou Sen inspiring him...
...and thanks to the exceptional training, he was already a master as he could perform advanced spear techniques like Dragon's Talon/Ryuu Shi at the young age of 18 years old.
Those who practice Hokuto Shin Ken/Big Dipper God Fist (Fist of the North Star) train to unlock and use their bodies' full muscle potential.
Rock Lee (Naruto) is well trained even with extremely heavy weights.
Genkai (YuYu Hakusho) was an incredibly skilled martial artist known to humans and demons alike. Her personal Reihado-ken fighting style allows her to revert her body to its peak. She is also a harsh teacher with grueling, but beneficial, training methods.
Undergoing hellish and hard training under the teachings of Genkai, Yusuke Urameshi (Yu Yu Hakusho)...
...learned the Spirit Shotgun,...
...and had his Spirit Energy greatly improved by the aid of her Spirit Cuffs.
Having intensively trained with his Stand since his youth, Jean Pierre Polnareff (JoJo's Bizarre Adventure) wielded his Silver Chariot with the expertise of a seasoned swordsman.
Shinobu Sensui (YuYu Hakusho) is a master of the Resshūken fighting style, which is said to be to be the strongest, most elegant, school of martial arts in existence. In addition to this, he was able to master the Sacred Energy with only six years of discipline instead of the usual forty.
Even in old age, Walter C. Dornez (Hellsing) possesses superhuman speed and acrobatic skills due to years of training and experience.
Akisame Koetsuji (History's Strongest Disciple Kenichi) has trained his body to that point that he has absolutely no unnecessary/useless muscle, as every single inch of his frame is composed of only pink muscle. Granting him nearly superhuman skills equal to the Elder.
While originally the weakest, Issei Hyodou (Highschool DxD) became the strongest reincarnated Devil of his generation through constant and rigorous training.
Cao Cao (Highschool DxD) has trained his body and fighting skills to utmost perfection, making him strong enough to defeat the most powerful supernatural beings.
Sword Emperor Elline (Sekai no Owari no Encore) attained his legendary swordsmanship skills through extremely hard training.
Having received the harshest military training for gifted children, Zeno (Zatch Bell!) is able to completely overpower and humiliate the majority of demons fighting in the battle to become king.
After entering the Chess Pieces, Chimera (Marchen Awakens Romance) honed her skills to near perfection. In less than 6 years, she was promoted to the exclusive rank of Knight class ranking 4th out of the 13.
Due to reincarnating, having an extremely large mana capacity, and training himself since he was an infant, Vandalieu (The Death Mage Who Doesn’t Want a Fourth Time) gained the strength to defeat individuals on par with S-rank adventures and Pure-Breed vampires at the age of 8.
Hayley Smith (American Dad!) is a sleeper agent from Project Daycare, trained to be an unstoppable killing machine, in which she proved in her attempt at her father's life upon her programming malfunction.
Bruce Wayne (DC Comics) gained near superhuman abilities through years of training.
Dick Grayson (DC Comics) became a formidable fighter thanks to intensive training.
Even without using Venom, Bane (DC Comics) possesses nigh-superhuman physical abilities due to training.
Kal-El/Superman (DC Comics) underwent training with Mongul II to break all the mental blocks and limiters he placed on himself, allowing him to utilize the full extent of his Kryptonian powers.
Jigsaw (Marvel Comics) possesses incredible physical abilities due to constantly working out while in prison, enough to overpower Spider-Man and break his wrist.
The Karate Kid (DC Comics) possesses such skill in martial arts that he can damage solid rock and metal, as well as briefly hold his own against superpowered opponents.
Through The Hercules Method, Luther Strode (The Strange Talent of Luther Strode) developed physical and mental abilities beyond any normal human.
After his home was taken over by Aku, Jack (Samurai Jack) was sent by the plan of his parents to undergo various forms of training by the greatest and most renowned warriors and scholars of the world and became an incredibly skilled and powerful warrior as a result.
The X-Men (Marvel Comics) training daily inside of the Danger Room.
Bucky Barnes (Marvel Comics) received training in Hand to Hand combat, Reconnaissance, and surveillance in hostile environments, Marksmanship...
....and combat training from S.A.S veterans during the days of WWII.
Karnak Mander-Azur (Marvel Comics) is only inhuman who did not undergo terrigenesis as he came of age, all his powers and abilities come from decades of intense physical and mental strengthening regimens he partook throughout his life.
X-23 (Marvel Comics) training.
After training with Shang-Chi, Peter Parker/Spider-Man (Marvel Comics) combined his bullying experiences, combat lessons from Steve Rogers, kung fu training, and his own spider-powers to create a new martial arts style, the Way of the Spider.
Having had centuries to hone his skills and power, Chase Young (Xiaolin Showdown) is one of the greatest martial artists of all time.
Buffy Summers (Buffy the Vampire Slayer) has extensively trained to hone her skills and Slayer powers...
...to the extent that she was able to take on an MMA fighter twice her size while stripped of her powers and beat him unconscious.
Charles Gunn (Angel) has trained since childhood to face vampires and demons, allowing him to hold his own against and easily beat them.
Sam and Dean Winchester (Supernatural) were trained from childhood to hunt down, track, kill, and fight supernatural creatures, allowing them to easily hold their own against vampires, demons, monsters, etc.
Jann Lee (Dead or Alive series) is strong enough through training to beat a T-Rex unconscious with his bare hands.
Lady (Devil May Cry) has extensively trained to face demons, allowing her to hold her own against demonic entities like Dante and Vergil.
Through training, Solid Snake (Metal Gear series) is able to pull off feats such as dodging bullets from multiple ranges and withstanding electrical torture.
Ryu Hayabusa (Ninja Gaiden series) attain immense physical prowess and tremendous combat skills through extremely rigorous training since childhood.
In shown in multiple incarnations, Link (The Legend of Zelda series) learned incredible sword techniques from either training under certain masters or learning from scrolls. Aside from his swordsmanship, most incarnations of Link have acquired skills in hand to hand combat from his hometown.
Through extensive physical training, Chris Redfield (Resident Evil series) possesses sufficient strength to hold his own against superhuman beings like B.O.W.s and Albert Wesker...
...and move boulders several times his own height and weight
Segata Sanshiro (Sega) has trained so extensively in martial arts that he can pull of a variety of superhuman/supernatural feats, such as causing those he throws to explode on impact with the ground, kick a baseball for a home run, and survive in the vacuum of space unaided.
Ryu (Street Fighter series) has trained extensively in the Ansatsuken fighting style under Gouken, bestowing such abilities as ki manipulation.
Though elderly, Heihachi Mishima (Tekken series) possesses incredible strength and electrical powers due to his training in his family's Mishima-Style Fighting Karate.
General Dru-Zod (Injustice: Gods Among Us) learned from another Phantom Zone inmate to manipulate the zone's existence for his own use.
After his first defeat at Kirby's hands, King Dedede (Kirby) extensively trained in order to learn Kirby's Flight and Inflation abilities.
In addition to his status as an Olympian demigod, Kratos (God of War series) was trained as a Spartan warrior from birth and received further training from Ares, making him a deadly warrior capable of fighting and defeating godly beings.
In addition to her Power Suit and Heavyworlder Physiology, Samus Aran (Metroid) has trained as a warrior since childhood, making her a superior athlete with physical abilities and skills beyond those of normal humans.