Support you can trust. With a break strength of more than 6,000 lbs., Primal 7 straps are as trustworthy as a seat belt. The bands are tested to support three times their rating and the buckles can withstand 2,000 lbs. of pulling force. Make your doorframe your gym. If you have a door that closes toward you and shuts completely, that’s all you need. Primal 7 leverages your door frame to support your weight, not the door itself. If you would like to read more about it and see the excercise videos https://primal7movement.com/products/primal-7-exercise-system