The FLEXTEND® Training System is a patented, multifunctional exercise system that helps to provide relief from the symptoms associated with many types of Repetitive Strain Injuries (RSI's) and Musculoskeletal Disorders (MSD's) affecting the upper extremity. This is achieved by correcting the strength and length imbalance that often exist between the overused and underdeveloped muscles of the fingers, hand, wrist, forearm, elbow, upper arm (biceps/triceps) shoulder, chest and back. Variances in length and strength between opposing muscle groups are a commonly recognized condition known as "muscle imbalances", which can be corrected with ease when undergoing an appropriate exercise and stretch routine.

FLEXTEND® comes with a variety of attachment training systems (AC and TFT Kits) that increase the number of therapeutic exercises that it can perform for:

- Hands / Wrists: Carpal Tunnel, Guyon's, Cubital Tunnel, DuQuervain's, Trigger Finger.
- Shoulders: Rotator Cuff, Impingement Syndrome, Frozen Shoulder.
- Chest: Thoracic Outlet, Impingement, Post-Op Surgery for Pec Tears, etc.
- Back: Levator Scapular, Rhomboid, Postural Disorders.
- Arms: Biceps and Triceps Injuries, Post-Op Recovery, etc.

The FLEXTEND® exercises are specifically designed to strengthen all of the weak, underdeveloped muscles and tendons in the entire upper extremity in multiple planes of motion. All of the exercises isolate these muscles in different ways, providing specific, yet total involvement of the muscle group being addressed. Combining the lengthening and strengthening effects of FLEXTEND® on muscles and tendons help to reduce external pressures on the underlying soft-tissue structures within the finger, hand, wrist, elbow and shoulder joints caused by overly restrictive flexor, pronator and internal rotator muscles. This in turn, may decrease pressure on the underlying blood vessels, allowing normal blood and oxygen transport to the affected areas.

Strengthening specific muscle groups while simultaneously stretching and lengthening opposing muscle groups can assist in keeping the muscles in balance and reducing one group from overpowering the others in such a way as to create an abnormal contracted posture of the fingers, wrist, elbow and shoulder, which can also increase pressures on the structures within the finger, wrist, elbow and shoulder joints.