Level 1: Stand in front of stairs and place hands on a step at about chest height, body in line from head to heels. Bend elbows to sides, lowering chest toward stairs, and push back to start. Begin with 6 reps. When you can easily do 12 reps, move to level two. MORE: Tone Your Inner Thighs With These 8 Moves Level 2: Make it harder by moving hands down a step and stepping feet farther away from stairs so body stays in line. Repeat from this height. MORE: 10 Abs Exercises That Are Better Than Crunches Level 3: Lower one step each time you’re ready to progress—the closer you get to the ground, the more challenging the move.
