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Side plank crunch Lie on left side with left hand on floor beneath left shoulder, right fingers behind head; let inside of right foot rest on floor in front of left foot. Tighten abs; push into left hand to lift body so it forms a diagonal line from head to heels. Crunch forward and down, bringing right elbow to left elbow; return to starting position. Do 10 reps; switch sides and repeat.
Chair Circuit (set an interval timer for 40 rounds of 30-seconds work and 10-seconds rest; repeat the following sequence five times: 1. step-ups right, 2. step-ups left, 3. elevated knee tucks, 4. alternating leg lifts, 5. elevated lunge jumps right, 6. elevated lunge jumps left, 7. triceps kick dips, 8. hanging knee raises)