The value of the vertical jump is that it show's a player's ability to burst off the line of scrimmage with lower body strength. That's why the drill is important for linebackers and defensive linemen despite the fact that they, in theory, are not jumping around much trying to defend passes.
Wrist tendonitis, also called tenosynovitis, is a common condition characterized by irritation and inflammation of the tendons around the wrist joint. Many tendons surround the wrist joint. Wrist tendonitis usually affects one of the tendons, but it may also involve two or more.
By far, the most common wrist injury is tendonitis. There are two main groups of tendons in your wrist. One group on the back side of the wrist extends or straightens the wrist and fingers. The other set, on the palm side, flexes (or bends) the wrist and fingers. Injury and pain on the back side (extensor side) are more common.