A stretching device comprises a wearable body harness with an adjustable central hold arranged around the upper body connected with an adjustable extension strap configured to engage a foot at a distal end. The extension strap is slidably connected to the central strap to move along the length of the central strap. The extension strap comprises a non-elastic material, divided by a single elastic segment. The extension strap having incremental markings designating amount of adjustment. The device and method of using the device provides a comfortable tension, facilitates hands free stretching in the supine position, improving duration of stretching and range of motion. An independent adjustable stretching strap for upper body and shoulder stretching, further comprises a non-elastic material looped at each distal end, divided by a discrete elastic segment and having incremental visual markings designating amount of adjustment.