DUMBBELL ABDOMINAL CRUNCH
Do: 3 sets of 45 seconds, 15-second rest between sets
(a) Lying on your back, raise your feet towards the ceiling.
(b) Holding a dumbbell in each hand with your arms stretching towards the ceiling, raise your shoulders and upper back off the floor, reaching the weights towards your feet.
(c) Slowly lower your upper back and shoulders back down to the floor.