How Range3D works

  • Range3D uses the method of passive static stretching, where the stretch is held for a prolonged period by external means
  • Each exercise starts from a neutral position, making Range3D suitable for all levels of flexibility
  • There is a smooth transition from one exercise to the next with no adjustments needed in between
  • The stretching action occurs at the hip joint and is not transmitted to the pelvis and lumbar spine
  • Every hip muscle group can be isolated
  • Range of motion measurement enables left and right legs to be compared and quantifies improvement
Neutral position

Electronic display console

The head rest and leg supports are adjusted according to the user’s height. The sliding ankle support accommodates variations in lower leg length and cups the heel to prevent the foot moving. Access is from a footplate at the front, allowing the user to sit within the leg supports, which are bent at the knee. The leg straps are fastened first and the waist grips are tightened once the user is lying back. The body is now fully supported, and the pelvis and non-stretching leg will be kept still during the exercises. There are two handles to move each leg support, providing leverage in every exercise position. The vertical movement is geared so that the leg supports can be raised easily, and dampers ensure they are lowered safely.

The user switches on a ratchet before moving a leg support, and the 2° or 3° intervals provide fine control at the limit of stretch. The ratchet will maintain the stretching tension for as long as required. The leg can then be either moved further into the stretch or returned to neutral once the ratchet is switched off. The leg supports rotate about axes which coincide with the hip joint, enabling the true range of motion for each exercise to be accurately measured. Calibrated position sensors produce an electronic output which is displayed digitally. A “hold” feature allows the reading to be retained until the same exercise has been performed with the other leg. The duration of the stretch can also be timed.


The opposite leg is kept extended to prevent the pelvis tilting posteriorly, so the ideal stretching position is maintained.

In the same position as the hamstrings exercise, the knee is flexed and brought to the chest.

The body is in a fully extended position with the pelvis stabilised.

The opposite leg is flexed at hip and knee to enable adduction in the frontal plane. This exercise is particularly beneficial for iliotibial band syndrome.

The leg is placed in the standard orthopaedic position to stretch the rotator muscles.

The lateral rotators include the piriformis muscle which, if shortened, can cause sciatic nerve pain.

One-joint hip flexors: The opposite leg is fully flexed to tilt the pelvis posteriorly and bring the hip into extension. Gravity provides a downwards stretching force, which can be increased by using one of the handles.
Two-joint hip flexors: The exercise is repeated with the knee flexed at 90°.