It's my left shoulder too, and I really can't pin it on any one thing other than shitty form and ego lifting years back.
In May of 2013, I was trying to pull out a window, as I had done for years during spring cleaning. In this case it was somehow misaligned, and I kept pulling and pulling, until I resorted to tugging with momentum. And then I felt a snap at the back of my shoulder. It has gotten better since that incident, but it hasn't been the same since. In fact, I think my left shoulder is slightly atrophied compared to my right one. On the plus side, I caught up on all my swearing that day.
Thankfully it only hurts now when I throw a softball and to be honest in a game I maybe have to make a throw 5-6 times at best. Stopped flag football years ago with a dead arm and have not touched a racket in years. Hoops does not put any strain on it since I light it up from 3 point land. Soccer I still love throw ins and those are also not a strain on shoulder. When I do push ups I hear/feel a little click on the way down but no pain thankfully!
Just a quick word of advice: don't flair your elbows out more than 45 degrees from your body when doing push ups. The pictures we see of people holding their elbows out at 90-degree angles while doing push ups are dangerous clowns.
This is hard. After reading this thread, I tried doing the front hold (standard olympic barbell held in outstretched hands) a couple days ago. Have done military presses in my prime with 185 lbs, so I figured I would get at least 10 seconds. Took all I had to get 5 seconds. Certainly could increase the time with training, but after trying it, my hats off to anyone who can get 20+ seconds. Found this old youtube clip of a guy doing the movement for 1 min 13 seconds (near world record at the time). He looks about 80+ lbs heavier than me, with shorter/thicker arms so definitely some natural advantages. Also, looks like doing the front hold with 30KG (66 lbs) is a Strongman event.
Great video, thanks for adding it. I love the feel after doing that exercise. It can increase with training of course. I am starting lower weight and working my way up. Will post video if I get to 45 lbs. @ 30 seconds .
Funny to find Babounian in a thread about Bruce Lee, they really don´t have much in common. He was a regular fixture in Strength Wars : https://www.youtube.com/results?search_query=strength+wars Amazing the level of delusion Bruce Lee fans can get , this thread should go to the Hall of Fame
Okay, just one more question about this exercise. Why are you so enamored with it? It's basically a front lateral isometric. The front lateral raise is perhaps the most redundant exercise there is. You already work your anterior delts with every pushing exercise you do, be it bench press, incline press, push ups, dips, or whatever. And you work them in a more natural manner. Further, it's a single joint exercise, so you're not even getting the metabolic effect of a compound. Finally, the front lateral raise has absolutely no evolutionary relevance, so any "functional" argument is specious at best.
It is just one exercise of many not a single isolated workout all rolled into one. I added it to my shoulder/back routine, not as a replacement.