This is because the fitness equipment is coated with excessive lubricating oil, which will lead to the machine itself. The muscles of the waist and abdomen contract, and the resistance generated by fixing the upper body with both hands makes the lower limbs rotate left and right. Waist twister is a kind of fitness equipment which can achieve the exercise effect by twisting the waist and lower limbs, and it has a good effect on the exercise of waist and abdominal muscles.