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Bicycle Crunches are an exercise that specifically targets the oblique abdominal muscles.
Lie on your back and place your hands behind your head. Lift your legs so that your thighs are perpendicular to your body and your shins are parallel to the ground.
Bend your left elbow and simultaneously bring your left knee toward your chest. Avoid pulling your head with your hands, but rather use your abdominal muscles to lift your upper body.
Now extend your left leg and simultaneously pull your right knee toward your chest, bending your right elbow.
Alternate sides in a flowing motion, as if you were riding a bicycle.