IdealStretch-Original- Hamstring Stretching Device with Instruction Card –... Featured! $56.95 – $59.95 Make sure this fitsby entering your model number. HAMSTRING AND CALF STRETCHER: Most effective hamstring stretching device, stretching the hamstring and calf at the same time. BACK AND KNEE STRETCHER: IdealStretch also relives tight and short Illio-Tibial (IT) band tissues, reducing lower back, knee, and lateral knee pain. Stretching the hamstrings relieves back pressure and pain.