How bodyweight training is not really "bodyweight"

" First of all, exercise is exercise. Period. The name of the game is resistance. A muscle contracts against resistance and, with perseverance, over time, becomes stronger. For strength to increase, the amount of resistance or load worked against must also increase over time. Hence the problem with bodyweight conditioning - as the resistance (weight of the body) is fixed, how to continue to increase strength? Surprisingly the answer is simple - by decreasing the amount of leverage it is possible to exert on an exercise, the resistance of an exercise becomes increasingly greater. For example, a hanging straight leg lift is much harder than a tucked leg lift. In both exercises the weight of your legs remains constant, however by reducing your leverage (i.e. in this case straightening your legs) we are able to greatly increase the resistance. By straightening the legs we have effectively doubled the difficulty of the exercise even though the weight of the body has remained constant. " Chris Sommers