Whittle your waist with this 20-minute routine based on Kira Stokes’s super-hot Core Cuts class at the Reebok Sports Club/NY. These standing ab moves require lots of balance and stability, giving your core muscles an extra challenge. Do this workout 3 times a week (plus 40 minutes of intense cardio 4 times a week) and you can lose 2 inches off your midsection in just four weeks. 

Do all the moves once, then repeat the entire circuit 2 more times.  Stand with feet slightly wider than hip-width apart, with your weight on your right leg and a 3- to 5-pound dumbbell in your left hand. Stretch your left hand up and overhead to the right so you feel a stretch in your left side waist (aka your oblique). Read more here: