Swing-Machine X-Factor - Used and Recommended by Professionals. The ultimate dual-direction golf-specific stretching device for a more flexible, relaxed backswing. Adjustable resistance to strengthen all the swing related muscles for increased power. Mechanically guided path to encourage and reinforce the correct swing plane and groove the muscle memory for straighter, more consistent ball flight. Dynamic Rotational Resistance? trains the muscle firing sequence for better swing tempo. Biomechanically engineered grip path develops proper hand position throughout the swing motion. Stand-up operation allows twisting crunches for a slimmer, more athletic build. Perfect for teens through seniors, men and women. More Info About Swing Machine X - Factor