Feel Confident as Hell at the Beach With 5 Flat-Ab Moves

Karena and Katrina love this simple core-toning move.

• Begin lying on your back with your legs bent and arms straight in front of you.
• Engage your core to lift your shoulders off the ground. Continue raising your upper body off the ground until you are sitting straight up.
• With control, lower back down to the ground.
• Complete 15 reps.