Stand with your feet shoulder-width apart. Flex your knees slightly.
Clasp your hands and raise them straight up above your head, elbows slightly bent.
Lower to a squat as if you were sitting down into a chair (squat) while bringing your arms straight out in front of you (chop).
Squat as deeply as you’re able, watch that your shoulders do not drop forward.
Stand up from the squat while raising your hands back up above your head.
Aim for 3-4 reps of 10 to 15 daily.
Once you’ve mastered the basic movement, add a weight between your hands.
#MarktheSpotMassage
Tennis uses most of your core muscles, and puts particular strain on your elbows and shoulders. A good stretch before and after you play will help keep you from injury. If you’re still stiff and sore, come in for a good neuromuscular massage. 
Mark the Spot Massage Therapy 