The air bike is a great exercise that will work your abdominal muscles by imitating the bike riding motion while you lay down flat on the floor. lie on the floor or a mitt with your lower back press to the ground. Position your hands lightly on either side of your head and bring the knees up until your lower legs are parallel to the floor. Simultaneously, click forward with the right leg and bring in the knee of the left leg while exhaling. Bring your right elbow close to your left knee by crunching to the side while inhaling return to the initial position. The entire movement should simulate a cycle pedal motion.

Repeat the exercise with the opposite leg and continue alternating