ning up your quads. If you want to have explosive power, try doing box squats. Setting a box of the appropriate height behind you is the only preparation you need. Pause every time you meet the box before proceeding with the squat.TestoBoost Pro Mix some real sit-ups in with your crunches. Sit ups have generally received negative comments in recent years. Stay safe, do not try to do any of the anchored-feet type of sit ups. The strain put on…