Stand holding dumbbells on each shoulder, elbows bent, feet slightly separated, legs straight but not locked. Contract abs to bring spine to a neutral position.

Step sideways with left foot, bending knees until thighs are almost parallel to the floor, body weight toward heels. Straighten legs, pushing off left foot back to starting position. Repeat, squatting to the right; continue to alternate sides to complete all reps on each leg. Weight: 5- to 12-pound dumbbells. Strengthens quadriceps, hamstrings, buttocks, upper hips and inner thighs
GYM OPTION Leg press (with feet hip-width apart). Weight: none added, up to 225 pounds (including two 45-pound plates on each side)