When you want to work your core, back, and arms in one go, then a hanging knee tuck needs to be your go-to move. This seemingly simple bodyweight exercise requires just a pull-up bar and your ...

Start at Level 10 and do 20 push-ups, 30 sit-ups, 20 dips, 10 military presses, 20 hanging knee-ups, then rest. Level 9: Do 18 push-ups, 27 sit-ups, 18 dips, nine military presses, 18 hanging knee ...