This 24-inch box is worth having just for the jumping workouts: These create strength and power in your legs and butt, and help with acceleration. Tip: Be sure to focus on jumping off as well as on. "Building the strength needed to land and decelerate softly can help prevent injuries in lots of sports," says Rast. [$112; muscledriverusa.com]
DO THIS: Basic jumps. Hop onto the box, straighten your legs, push your pelvis forward to a full upright stance, bend your knees, and jump back down. Repeat 15 times.
• Decline push-ups. Put your feet on the box and do push-ups.
• Dips. With your back to the box and your legs straight in front of you, lower yourself.
• Steps. Instead of jumping, use your box as a tall stair to build leg strength, stepping on and off.
• Lunges. Put one leg behind you on the box, your other leg in front of you, and squat.