IdealStretch Original Hamstring Stretcher Device Reduce Pain Jerrys Flex Stretcher 155cm Yoga Stretching Belt Calf Leg Foot Flex Stretcher Foot Stretcher Mua DMoose Fitness Foot & Calf Stretcher Hamstring Stretcher for Hip Flexor and Hamstring Stretch YouTube. Training device for stretching and warm up exercises. Great for improving flexibility and a useful device for increasing range of motion. Information booklet included.