 It's great working out with my friend Alicia, she definitely keeps me in check and makes sure I'm doing it right, together is better. Another exercise that you see real results from is the sit-up pass using the Opti-Medicine Ball. The medicine balls make toning these areas achievable and fun. You both need to be laying face up for this one, knees bent, feet flat on the floor with your ankles overlapping. Contract your abs and sit-up, bringing your arms and the medicine ball to face your partner. After passing the ball, your partner then takes the ball overhead to slightly tap it on the ground behind their head before sitting up. Standing back to back, place your feet hip-width apart, pull your abs in tight and keep your back straight. Keeping your feet planted, twist from the waist towards each other, passing the ball to each other. So this is one of my faves because it gives you like ultimate ab definition. So if you're thinking bikini body ready for summer, this one is ideal.