>You can get strong enough to bench-press 400lbs simply by doing bodyweight exercises
I don't see how this would ever be possible - is there a specific method you're referring to? Coaches don't put football players in front of a p90x DVD, they stick them under a barbell add some heavy weight to it.
It's possible by using leverage to increase the difficulty of an exercise. For example, with the push up, you can start by doing normal push-ups, then elevate your feet to add resistance. Eventually, you should be able to do handstand push-ups. When you are strong enough, you can start working through the series of exercises that leads up to doing a planche.
Except for the fact that is baseless and ridiculous. Pushups and Handstand pushups use different muscle groups. Me being capable of doing handstand pushups does not translate in any way to me pushing more on a bench press.
Aside from the fact that you only read half of my comment, the bench-press and handstand push ups don't completely overlap, but some of the same muscles are used for both of them.
Am I wrong or do these two exercises seem to target the same muscle groups?
Also, the muscle groups targeted by both exercises depends largely on hand placement. The same would apply for hand-stand push-ups, just to a lesser degree.
I don't see how this would ever be possible - is there a specific method you're referring to? Coaches don't put football players in front of a p90x DVD, they stick them under a barbell add some heavy weight to it.