I used to loathe the squat because it's hard and, well, it hurts. But it's one of the best lower-body strengtheners, so I found a move that doesn't strain my knees and is still effective: the weighted lateral squat. To do it, stand with legs shoulder-width apart, with a 12- to 20-pound body bar on your shoulders. Squat down, taking a big step to the right with right foot. Hold for 5 counts, contracting glutes. Return to starting position, dragging your right foot back. Alternate sides for 20 reps.