air bike

Lie flat on your back with your hands placed behind your head. Lift your legs off the ground and bend your knees at a 90-degree angle. Bring your right elbow towards your left knee while simultaneously straightening your right leg. Return to the starting position and repeat the movement on the opposite side, bringing your left elbow towards your right knee while straightening your left leg. Continue alternating sides in a pedaling motion for the desired number of repetitions.