Just Do It: 5 Moves to Strengthen Your Back

Balance Builder

Targets: Postural muscles along spine

Begin on all fours, hands under shoulders, knees under hips, abs pulled toward spine. Lift right arm along ear, parallel to floor, thumb up. At the same time, slide left leg behind you on floor, lift slowly, parallel to floor. Hold 3 to 5 seconds, 10 to 15 reps per side.
You're doing it wrong if... low back arches, head drops below shoulder, hips are uneven.