I think enough people who love golf can relate to the question I got on one for the forum’s I moderate. It was common enough that I decided to share it with my Pain Free Living readers. The names have been left out to protect the innocent . BTW, please feel free to share this blog post with your golfer friends 
The Question:
I was hitting a Golf shot when my club hit more of the ground than ball,I felt a twinge under my left shoulder and upon futher review I found out it was my lattimus dorsi muscle.I took a couple days off and it healed I thought by using ICY-Hot patches.when back to playing Golf for a week nothing happened then I hit a shot no ground involved but the same thing happened,what exercises can I do and what else do you recommend
My Answer:
Ouch, I felt that as I read your description of hitting the ground at that level of impact. I agree that it was your latissimus dorsi, but I think some other muscles are probably also involved, specifically infraspinatus, teres minor and teres major. If you do an internet search you can see the muscles and see why the sudden stop and push back on your shoulder blade could cause pain.
If you would like to read why doing something repetitively, such as swinging a golf club, I suggest you go to https://julstromethod.com and also read the sections titled “Muscles and Pain” and “What’s happening Exactly.”
As for what to do about it, I’ve been teaching people how to self-treat muscle spasms for over 20 years and I think the best thing for you is to take a tennis ball and put it directly on the area where you were hurt (in front of your shoulder blade, underneath your arm) and then either lean up against a wall or lie on the ball on the floor. It’s going to hurt, but stay on it for at least 30-45 seconds. Then look around for other tender points, each of these are spasms. If you go online and see the infraspinatus muscle you’ll know where to treat it. It’s on the flat part of your shoulder blade. You can put the tennis ball on the thick part of the muscle and just lean into the wall or floor.
There are many other self-treatments you can do for your shoulder, and as a golfer it would be worthwhile for you to frequently release the tension that is forming in your muscles, you’ll be surprised to see how many strokes you can cut off your game!
Wishing you well,
Julie