Lie on your back with knees bent and feet up at 90 degrees. Place your hand on the floor either side of the hips. Head stays rested on the floor.
Squeeze the lower abdominal area and lift your hips off the floor in a smooth movement without any jerks, curling and bringing the knees towards your chest. Slowly lower down. Lift up again without allowing the muscle to rest between repetitions.
Advanced level: Do the same with your legs straight up towards the ceiling.
Also read: Physical training with a Resistance Tube!
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