The back and the butt are target areas for many fitness fanatics, and famous individuals face the same challenges as the rest of us. In fact, celebrity workouts often focus on these problem areas. Celebrity trainers (whose clients have included Reese Witherspoon and Heidi Klum) have some tips for toning these trouble spots:
For glutes:

• Stability ball scissors: Lie across a stability ball with your hips resting on the ball and your hands and feet on the floor. Walk your legs out behind you to a V position. Lift your feet about a foot off the floor and squeeze them together, supporting yourself on the ball and with your hands on the floor. Lower your feet back to the floor and return to the V shape. Repeat 15-20 times.
• Sidekicks: Stand with your feet slightly wider than your hips and your knees slightly bent. Kick your right leg out to the side and slightly behind you. Lower down and repeat 15-20 times, then repeat on the opposite side. To make this tougher, use ankle weights or a pulley machine.

For the back:

• Lateral pull-downs. You need a lat machine for this, but an important point is to think about trying to touch your shoulder blades together behind your back as you pull down. If this seems too difficult, reduce the weight and focus on form.

An important tip to keep in mind when doing glute and low back exercises: Concentrate on tucking your tailbone in and pulling your belly button towards your spine. These micro-movements will help reduce the strain on your lower back.