1. Assembly according to βAB ROLLER ASSEMBLYβ Level 4.
2. Kneel on the base with your back and thighs 90-degree. Hold the Ab roller under the shoulders.
3. Push the roller as forward as possible.
4. Pull the roller back to the starting position.
Keep your body as close to the ground as possible, but don't touch the ground. Make sure the movement is slow. This exercise is not suitable for people with lower back problems or lumbar disc herniation.