Elbow Pain During Squatting

What’s the best way to stretch / warm-up the tendons around the elbows prior to squatting? I typically workout in the afternoon, but today I worked out in the morning, and the tendons around my elbows were screaming at me. I’m guessing this is what tennis elbow is? It’s a pinching pain that’s pretty severe, but I don’t lose any grip or functional strength so it’s really just minimizing the pain.

Anyone have any good stretches or warm-ups? I switched to low bar squats about a year ago, and I love every aspect of it. It’s the only way I’ve been able to truly get my squat numbers up, but lately it seems like the elbow pain is the true limiting factor, as opposed to my leg strength. I don’t think I can go back to high bar, but I can tell just when I setup that there def seems to be a pretty extreme amount of stress on my elbows as I’m really full bent in the low bar position.

Really appreciate any help from folks who’ve struggled with this in low squats or in other exercises!