I can't believe none of these people get it, here is another demonstration that seems most people here are incapable of doing.
The ability to based their strength and physical abilities on gravity, depending on gravity the stronger they became, and longer they become exposed to gravity the more permanent the changes of strength with or without being in gravity afterwards, and once they reach a limit they can control and alter the concept of gravity itself, even being immune to black holes, defying the logics of any cosmic phenomena related to gravity or black holes, such as time and space. They have to do weight training and practise balancing to understand how to use their abilities. Think like Dragon Ball how they train with weight or gravity but their abilities are also focused on that as well as it all goes around together.