Try the following three exercises, which force your abs to stabilize your body while you move your arms and legs. Do 2 sets, 3 days a week and you’ll see results in as little as 30 days.

T PLANK Assume full push-up position with hands directly beneath shoulders and arms extended. Hold for 10 seconds. Rotate body to the right, extending left arm toward ceiling; keep hips lifted, so body forms a diagonal T. Hold 10 seconds. Return to start. Repeat to opposite side. That’s 1 rep. Perform 2 or 3 reps.

ROLL UP Lie back with legs bent, knees pulled toward chest, hands clasping shins. Inhale, “hollow” abs, and roll to sitting position, balancing on tailbone. Extend legs down to floor, bend forward from hips, and reach toward toes. Inhale, sit back up, and exhale as you slowly roll back to floor. Return to start position. Repeat 5 to 10 times.

STATIONARY BICYCLE Lie on back, hands behind head, knees bent. Lift feet off floor, so legs form a 90-degree angle, calves parallel to floor. Pull navel toward spine and lift head and shoulders off floor. Curl right shoulder across body toward left knee while extending right leg. Do not draw left knee into chest. Keeping torso lifted, switch sides, bringing right leg back to start and curling left shoulder toward right knee, while extending left leg. That’s 1 rep. Do 10.

Additional pounds lost by women who exercise to music, compared with those who sweat in silence.

Source: Fairleigh Dickinson University

Percentage increase in distance covered when men walked for 6 minutes in a group compared with walking alone.

Source: British Journal of Sports Medicine