TRNR Hand Flexors 3 PackFlex away for greater grip strength and finger forearm mobility with the trio of TRNR Hand Flexors. The anatomical design optimises functional movement patterns, helping you strengthen the extensor and flexor muscles running from your elbow to your fingers. With three distinctive resistance levels from light to heavy you can be sure to find just the right level of challenge for your needs. Features: 3 finger & forearm exercisers (Beginner,