Challenge: perform as many repetitions as possible (maintaining good form) for at least five days of the week. Keep track of your repetitions on your calendar or journal. Which day did you perform the greatest number of repetitions? Celebrate your improving strength and share your outcome with a friend or training partner.

1. Start in a push-up position. 2. Lower your torso toward the ground. 3. Push back up and drive one knee toward your chest. Then drive the other knee toward your chest. 4. Repeat #2-#3 for as many repetitions as possible. Be sure to: Keep your body in a straight line and push your chest as far away from your hands as possible. You should feel it: Working your chest, arms, and torso.