4. Walking lunges (Works: legs, butt)
What you need: a clear stretch of floor
How to do it: Stand with feet shoulder-width apart. Keep chest high and abs tight as you step forward with your left foot, landing on your mid-foot and lowering yourself until the knee is at a 45-degree angle. At the same time bend the right leg until your right knee almost contacts the floor; continue stepping forward with each lunge (keep your torso erect, not leaning forward), alternating legs. Repeat 20 reps on each leg.
Why you need it: These lunges increase core strength, flexibility, and endurance, and they benefit the cardiovascular system, says Volkmer. "It helps when walking up stairs or hills."
Published May 2012, Prevention
Updated May 2012