Squats are one of the best ways to strengthen your hips, abs, quadriceps and hamstrings. Better yet, you can do them anywhere, anytime. The challenge consists of 5 exercises that make up one set. You will start off slowly completing 25 reps total, working your way up to as many as 150 reps on day 15. No equipment is required. However, if you’d like to increase the intensity you may add free weights or a band around your thighs for the exercises. If it is too challenging for you, use a wall or chair for support.