The TPR was designed with the understanding that each individual has variations in their body size and type. By changing the positioning of the body while using the TPR, it allows the user to target specific areas to get the maximum benefits. Although you don't have to be a specific height to use the TPR, it is most effective for users between the height range of 5'0" and 6'6". The TPR is also designed to be durable with a max weight capacity of 300 lbs.