Stand at the top of a short slide, facing out over the top (with your back to the slide). Hold on to a support above the slide and stand with your feet together. Bend your left leg to a 90-degree angle and drop your right leg down the slide, holding the bar for support. Stand back up on top of the slide and repeat. Do 10-15 reps with each leg. Muscles worked: Arms, shoulders, abs, back, hips, butt and thighs.