Multi-Function: Multi-Functional Fitness Aids For Helping You Roll Movement Belly Push Ups, Legs, Body SculptingAbdominals, Ab Support, Stretching Material:portable sit-up, thickened soft foam handle, non-slip, wear-resistant,High quality steel bracket and rubber suction cup, hard and stable, long service life. Easy installationThree heights can meet your different needs, press the spring buckle inward to adjust the height of the crossbar, press the black button up or down to release/fix the suction cup. Strong suction: fitness suction cup has strong suction, not loose, the strong suction cup can be firmly fixed on the ground. after wiping the floor with a damp cloth, the suction power can be further enhanced. Scope of application: Sit-up assistant device suitable for smooth surfaces like tiles, concrete-cured, marble, wooden floors, ensure the floor and suction cups are clean.