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.
Tendons connect muscles in your forearm to the bones in your wrist and elbow. Damage to these tendons -- called tendinitis or tendinopathy -- often occurs with overuse of your forearm muscles. Tendon injury causes pain near your elbow or wrist joints, where the tendon attaches to the bone.