For improvement of spinal curvature you are required to change out the density and diameter of rolls progressively, and that is why we sell foam roller sets at a discounted price. Additionally, if you sustain injuries or are sore from training, you need softer and smaller diameter rolls for short periods of time before using harder and larger diameter rolls. A professional athlete would especially benefit from owning a complete set of rolls to utilize as needed.
Restoring proper spinal curvature requires foam rollers properly sized to support the current neck and low back curves to lay over after performing the back twist exercise. Depending on existing injuries, pain and shape of your spine different diameters and densities are required for molding your spinal column into a more desirable form. We provide foam rolls in five different diameters and three different densities for the neck and low back. All in all there are thirty (30) neck and back shaper rolls, and two (2) Back Trac foam rolls.