Build Explosive Strength: Workout III
Exercise 5 Hanging Knee Raise
Sets: As many as needed Reps: 40 Rest: 45-60 Seconds
Hang from a chinup bar with legs extended . Now contract your abs, raise your legs, and bend your knees, curling yourself into a ball until your knees touch your forehead . Reverse the motion to return to the hang. That's one rep.