The Sling Trainer expertly and efficiently offers users an education, awareness, and training in rotational movement—using just a few bands. The power lies in this tool’s simplicity, and the key is in the placement of the bands and the tension and perception they create, both during and after use. The Sling Trainer can be a great tool in many sports, exercise, and rehabilitation-related spaces.

The Sling Trainer bands follow the Spiral Line of connective tissue, which also interact with the Lateral and Functional Lines. These tissues were outlined by Thomas Meyers in his book Anatomy Trains, and provided the groundwork for our design. The Sling educates and encourages a golfer to feel and train the rotational and bending movements in the golf swing. Proper loading and unloading of the anatomy beneath the bands produces a sling-like motion combining speed and fluidity seen in many of the longest and straightest hitters. 

Testers of the Sling Trainer saw both distance and accuracy improvements. The explanation is simple: with more rotation, a golfer will have better contact and more club face stability, producing more accurate and consistent shot patterns. The Sling is intended to interact with a golfer in a way that provides cues to organize and use these connected lines of tissue to create an efficient, reliable, and powerful rotational movement in the golf swing. More rotation also creates more length to the swing, increasing a player’s ability to create speed. The bands also provide a consistent environment to develop a repeatable cadence, rhythm, and tempo to the swing.

The Sling Trainer runs along the front of the Spiral Line and interacts with four major lines of tissue: the Back Line, the Spiral Line, the Functional Lines, and the Lateral Lines.

The Back Line starts underneath the feet, goes through the calves and hamstrings, into the erectors of the spine and up and over the head, into the brow. This tissue line is responsible for our ability to stay upright, and creates access for movement. The Sling Trainer foot strap encourages the athlete to engage the balls of the feet, turning on the Back Line to open up the ankles, hips, and rib cage for rotation.

The Spiral Line stems from the bottom of the back chain (the muscles that run from the back of your head down into your heels) and comes from the inside arch of the foot, up and across the lower part of the leg to the outside of the hip and across the body under the opposite armpit and into the base of the back of the head. This is responsible for rotational movement. The bands of the Sling Trainer both resist and assist the golfer to create proper rotation throughout the body.

The Functional Lines go across the body like an X across the midsection. These lines are responsible for various movements that involve bending and rotating the spine and rib cage across the torso. The bands of the Sling Trainer also encourage this rotation and bending of the midsection throughout the swing. 

The Lateral Lines run up and down the outside of the body starting from the outside of the foot, all the way up the side of the leg, side, and rib cage, through the armpit area and into the back and side of the skull. These lines are responsible for the side bending of the spine and rib cage. Because the bands of the Sling Trainer cross the Spiral Line and create movement both ways, the bands facilitate the golfer to bend the spine and rib cage appropriately with rotation. 

The cues the Sling Trainer provides in the feet encourage access to the back chain. Staying active in the balls of the feet and light in the heel activates the tissue under the arches of the feet all the way through the calves, hamstrings, and spine, providing the environment for rotational movement through the ankles, hips, torso, and shoulders. This establishes the address position and posture and allows the spine to move effectively. 

Once you have access and ability to use these tissues, properly moving energy along the Spiral Line provides rotation. The bands of the Sling Trainer run along the Spiral Line tissue, giving the golfer the awareness of where rotational movement is coming from and how to use that rotation to load and unload through the stretch and release of the bands. 

The Spiral Line runs under the Functional Lines that bleed into the movements of the torso, shoulders, and arms. This tissue moves in sync with the Spiral Line and provides the cues for the bending and rotation of the spine during the swing—cues that downstream affect the movements of the shoulders and arms.

The Spiral Line directly crosses the Lateral line in the side of the ribs under the armpit. This connection ties the Spiral Line and Lateral Lines together as the spine and rib cage is rotating and bending throughout the swing.

To sum up, the Sling Trainer guides players to hit balls that go further and are solid and straight, simply by training rotation. Rotation in the golf swing helps low-point control to strike the ball consistently with compression, increasing club face stability through the hitting area, and lengthening the hand path for more time to create fluid speed. This creates a sling-like motion where the player is rotating in one direction to wind up, and then unwinding all that energy in the downswing and follow-through.