Nicole Watterson (The Amazing World of Gumball) demonstrates.
Using the cybernetic implants in his arms, Vilgax (Ben 10) pumps up his arm muscles to the point where he can destroy a mountain with a single punch.
Gyanza Rujike (Black Cat) bulks up his muscles to the point of becoming bulletproof
Gyanza Rujike (Black Cat) increasing his muscles to the max by channeling all his ki to them.
Ayon's (Bleach) enlarging and increasing its arm's mass while using El Martillo/The Hammer.
Mask De Masculine (Bleach) gain a massive increase in muscles with his ability The Superstar.
Meninas McAllon (Bleach) using The Power to greatly increase her muscle mass.
Ichibē Hyōsube (Bleach) bulks up his muscles to break free of the absorbing barrier of Yhwach Blut Vene Anhaben.
Fone Bone (Bone Comics) shows off.
Bane's (DC Comics) size and strength greatly increase whenever he uses Venom.
Using Gigantification, Garlic Jr. (Dragon Ball Z: Dead Zone) gets a massive increase in muscle mass and size.
At his 100% Power, Frieza's (Dragon Ball Z) muscles greatly expand.
While entering Super Saiyan, Saiyans (Dragon Ball series) can increase their already impressive muscles...
...and after attaining The Second and Third Grade Super Saiyan forms the user's muscles bulk up immensely, to the point where speed is reduced.
Cell (Dragon Ball) bulks up his muscles.
In his Light of Justice form, Fusion Zamasu (Dragon Ball Super) gained a massively bulked up right arm...
...and he later bulks up even further in his rage at Vegito.
Caulifla (Dragon Ball Super), the first female Saiyan to demonstrate the Third Grade Super Saiyan form.
In her Legendary Super Saiyan form, Kale's (Dragon Ball Super) muscle mass increases dramatically.
Like Kale, Broly's (Dragon Ball Super) Legendary Super Saiyan form increases his muscle mass severely.
Master Son (Gintama) using Qi Gong to manipulate his lifespan, restoring his muscles when needed.
Raiden's (Metal Gear) cybernetic body can expand its artificial muscle.
Roronoa Zoro (One Piece) uses Ichi Gorilla and Ni Gorilla to pump up his arm muscles.
Vergo (One Piece) imbuing the muscles of his upper body with Busoshoku/Armament Haki.
Pica (One Piece) using Busoshoku/Armament Haki to bulk up his entire body.
Lao G (One Piece) using Jio-Ken to store up his chi from his youth, until he needs it later to boost his body strength.
Monkey D. Luffy (One Piece) can enter his Gear Fourth - Boundman form by infusing his body in Busoshoku/Armament Haki and expanding his rubbery muscles.
Conkeldurr (Pokémon) using Bulk Up to up its muscles, increasing offense and defense.
With his explosive anger
, The Hulk (Marvel Comics) can increase his already powerful muscles.
Using his mastery
of his Elasticity, Reed Richards/Mister Fantastic (Marvel Comics) can bulked up his muscles for hand to hand combat.
Nezhno Abidemi/Gentle (Marvel Comics) can increase the muscle-mass of his body, allowing him to drastically increase in size and strength almost instantly.
Little Mac (Super Smash Bros) after getting final smash to become Giga Mac.
Toki (Fist of the North Star) using Tenryū Kokyū Hō
to pump up his muscles, allowing him to use his full strength
Alex Mercer (Prototype) uses the Musclemass power to combat a Blackwatch super-soldier.
Using Power Perfume, Ichiya (Fairy Tail) can vastly enhance his physique to the point of bulking up his muscles and height.
Through the Great Water Arm technique, Suigetsu Hozuki (Naruto) can shift his own watery body fluids around to supplement his muscle mass.
Kibano (Yu Yu Hakusho) expands his arm muscles by absorbing
energy from his environment.
Toguro (Yu Yu Hakusho) can increase his muscle mass to over 100%.
Molecular Muscle Enhancer (Kim Possible)
Mikado Arm (Xiaolin Showdown) can enhance the muscles in the user's arms.
Metamorphia (Sonic the Comic) taking on a more muscular form.
With Migi's help, Shinichi Izumi (Parasyte) can enhance the muscles in his right arm enough to stop a speeding car...
...or bulk his arm up into a pure muscular appendage, allowing him to throw objects with enough force to pierce flesh.
Xander Bly (Power Rangers Mystic Force) using Mystic Muscles.
Mou Bu (Kingdom) using his Full Strength during his duel with Kan Mei.
After years of building up his upper body strength, Shin of the Hi Shin Unit (Kingdom)...
...can flex his muscles to instantly close up small cuts and wounds.
Cyrus "The Colossus" Rhodes (Transformers Animated)
James Heller (Prototype 2)
Zeus (Record of Ragnarok)
Kamala Khan/Ms. Marvel (Marvel Comics)