B08NSWDTZ3 NISHISHABI Home Training Fitness Machine Chin-Up Bar for Doorway with Extended Hand Grips Trainer for Home Exercise Adjustable Hanging Fitness Machine (Color : Black, Size : 66x100cm)

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Muscle portion of the exercise by the door suspension rod is suitable mainly arm muscles, the abdominal muscles, the upper half of the body of the muscle of the training, such as back muscles.
Wall-mounted comfort design: The pull-up station has high-density cushion support and armrests, which can effectively reduce the pressure on the spine and elbows, and provide comfort when exercising the abdomen, waist, chest and upper body.
It can be fixed at different heights of doorways for various exercises,not just pull-ups or chin-ups, but also sit-ups, push-ups, crunches and even stretching,and you can take it down easily.
We used the non-slip and extra-long foam grips to ensure the comfort of your exercise and can be applied to more exercises,we also have increased the thickness of foam grips provide pull up bar with extra comfort to minimize hand fatigue.

All you have to do is rotate each side in alternate directions and the bar will extend on both sides of the door frame,rotate until it cannot rotate anymore to make sure it is secured enough on both walls.