Elevating rims allow the central hub of a back roller to be elevated from the ground. Elevating the back roller allows the user to increase their flexibility as they bend their back over the central roller. A user can purchase one or a set of rims to interchange the back roller and rims to accommodate different stretching and exercises. The joining mechanism can be threaded coupling in one or both of the hubs or can be a telescoping connection with or without a spring-loaded pin in a hole. The rims can have ribs to allow an installer to grip the rim and twist the rim on an axle. The back roller can be fabricated with an internal thread where changeable rims can be threaded into the inner diameter of the back roller to change the amount of elevation.