tuesday suffered some unexpectedly difficult core exercises ( planks , side-planks , leg lifts , shoulder-bridges , inverse push-ups ) ; wednesday , their arms and upper torso were pulverised ( push-ups , press-ups , divebombs , seated-dips , curls , pull-ups ) ; and thursday reduced their legs to jelly ( squats , lunges , hip-ups , towel-curls , calf-raises ) .