Sometimes the simplest solutions are the best. Another industry first, the Sorinex Original Glute Ham Roller is the definition of a simply designed, innovative training solution. Designed specifically to be the best hamstring curl unit possible, we quickly found that it was great for a variety of ab, shoulder, leg and chest exercises as well. The Glute Ham Roller allows you to add or subtract resistance easily and is perfect for large groups, tight budgets, and mobile training needs.