This is why internal martial arts rule. They are slow, subtle practices. A practitioner of internal martial arts can achieve an internal strength that cannot readily be perceived by appearances.
By practicing slow, they are able to control speed. By practicing internal techniques they are able to control power without muscle mass. Internal martial arts cultivate internal energy and refined martial arts abilities.
Subtle, effective, and deadly skills emerge from internal training
The three main internal martial arts are Xingyi, Bagua, and Tiachi. Master Mike Patterson is doing a style called Six Harmonies Eight Methods Boxing, also known as Liuhebafachuan. You can see how much power he generates against his opponent using very little effort.