HIGHLY ADJUSTABLE: Sit-up machine can adjusts to three different gears for any foot size by flexible spring buckle, helping to hold your feet in place during exercise. SUPERIOR MATERIAL: Sleeted super-elastic wear-resistant eco-friendly foam material, comfortable and safe, protect the instep from pain, as well as not hurt your foot. WIDE USE: Can be used for roll belly movement, push-ups, side kick, sit-ups, stretching back, elbow plank, press-up to exercise the abdomen and tighten the whole body muscles, yoga exercise hands and legs, a variety of functions application. Suitable for fitness men & women. EASY INSTALLATION: Small occupation, easy to install and disassemble, quickly assembly simply take a few minutes, convenient to use. ADJUSTABLE DESIGN - Multi-function adjustable sit-up bar, three gear height is free to adjust through the spring snaps, meet different needs, suitable for a different crowd.