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The Reverse Crunch is an exercise for strengthening the abdominal muscles, especially the lower abdominals.
Lie flat on your back and place your hands beside your body.
Bend your knees and lift your legs so that your thighs are perpendicular to the floor and your knees are bent at a 90-degree angle.
Tighten your abdominal muscles and lift your buttocks off the floor by pulling your legs up and tilting your hips backward. Keep the tension in your abdominal muscles as you slowly return to the starting position.
Avoid using momentum and maintain control over your movements throughout the exercise.