Cycling: Stay in the saddle while pedaling up a hill, which will shift the focus from the thighs to the glutes.
Hiking: Steep hills put a direct emphasis on the backside, and trekking downhill works the thighs.

Running and Walking: Both activities are perfect lower-body toners, since you activate the glutes each time you push off a foot.

Skating: Every time you push off to move forward — whether you are on ice or using in-line roller skates — you engage the gluteal muscles.

Tennis: Lunging for the ball nets you a great behind. It targets the tush and gets your heart rate up at the same time.

Volleyball: Jumping to block or bump the ball requires constant lunges and squats, which give the lower body a workout.