A waist-defining exercise to strengthen the oblique muscles of the torso that help to flatten your tummy and tighten your waistline. This rollover exercise feels great for the lower back and hips too, as long as you roll slowly side to side, with core control.

Start: Lie on your back with your arms extended out to the side (at shoulder level) with palms up, abdominals pulled in gently to brace your core and keep your low back towards the floor. Keep your knees bent at 90 degrees and positioned directly over the hips as shown.

Action: Exhale and slowly lower your knees 45 degrees towards one side (allowing the top hip to lift off the floor) while anchoring the shoulders on the floor. Pause, inhale and lift your knees to return to starting position and repeat to the opposite direction. Keep your abdominals braced to support your low back. Squeeze your butt and inner thighs throughout the exercise.

Repeat 3 sets of 10 repetitions. For a greater challenge hold a 2-5 lb dumbbell between your thighs.