About a month ago when I was doing skullcrushers, my left tricep just gave out on me, forcing me to stop. It hurt a lot, so I gave it about 2 weeks to rest. A couple days after the injury, the pain went away. So after 2 weeks I tried some light one arm tricep extensions, but the pain came back. I found out that my tricep would only hurt when there is actual weight being used when training it, and that I still had my full range of motion (extending and bending) pain free when not using weight. The pain is on my tricep, specifically closer to the elbow. I thought this would be tricep tendonitis, but the my symptoms differ in that I cannot find any severe swelling, bruising, or any pain when extending and bending it fully. So far I've just been doing the usual ice and ibuprofen, but does anyone have any insight? Thanks.