Lack of disciplined approach to achieving flexibility through all the joints. Lack of body knowledge to motivate understanding of the need for well rounded preparation. Lack of training of the muscles most stressed in tennis- the rotator cuff, the adductors and abductors of the hips, the hamstrings, and the rear deltoids. Failure to achieve full muscle balance in training. Lack of appropriate hydration before and after matches or training.
Dehydration leads to pulled muscles, cramps, very slow recovery times, and lactic acid buildup.
Overtraining and ignoring injuries and need for rest. Inability to perform self diagnosis during the match. Lifting too heavy and not balanced and risking bursitis, injuries, and tendonitis. Let's take a look at some exercises for the rotator cuff, the adductors and abductors of the hip, and the rear deltoids. The first two shots are specifically for the rotator cuff.