So, I've always been a sedentary person, grew up as a nerd that played video games, and have always been very weak. I've often lost arm wrestles to girls. I've hit the gym two times in my life, at 16, at 19, and I'm 22 now and going back.

The second time I went to the gym, a friend of mine was forcing me to go a lot harder than I was comfortable with, at only 1 month in. I did 3x12 bicep curls to failure. He wanted me to go completely to failure. I used 10lb weights, that's how weak I am, and could only make it to 8. All was fine and good until my left bicep locked up in the 90 degree position 3 days later. Extremely painful, required tons of stretching to be able to move it, eventually it went away

I learned that it was Bicep Tendinosis and researched a ton about it, including the Overcoming Tendonitis articles. I was so ashamed and disheartened I didn't do immediate rehab on it.

From the moment the acute pain healed, and even today, my tendon now makes a relatively inaudible snapping or clicking feeling. It's not audible as a click or a snap or a crunch at all. Let me stress, it's not audible, but it's hard to describe the senation without using these words. I feel it especially during the eccentric portion of the movement. I feel 3 in the eccentric, and 1 on the concentric. On the eccentric I feel it at around 90 degrees and below, it doesn't seem to happen before then. It's like a snap that releases once I pass a certain range of motion.

I believe I just have very weak tendons from a sedentary lifestyle because I notice my tricep tendons have also been irritated and weak on occasion, so I've decided to treat them all.

Upon my return to the gym, I've implemented Steven's suggested rehab of bicep curls, 3x30, I use 5lb weights and I do this on both sides. I find it a little difficult to avoid coming very close to failure unless I assist through the concentric portion, but I feel a lot less burn if I skip the concentric, so not sure what to do there.

I have no current pain that I am treating, actually, but I'm aware that there is scar tissue/scar cartilage and a general weakness because the regular population doesn't get immediate inability to move their arm from one set of failure, so I'm hoping that doing 8 weeks 3x a week of this will help strengthen the tendon.

I have two questions though.

I'm not entirely sure if there are any tendon sheathes at the bicep tendon for it to be caused by friction, but...

Am I wasting my time? I've been under the assumption that the aligning of tissues stimulated by performing eccentrics might lesson this sensation or make it go away a substantial amount. I understand that cartilage and scar tissue can mainly only be removed with surgery, so am I stuck with this permanently? Or do eccentrics improve this at all, like at least 30-40%? The clicking is very mentally nerve wracking and makes me scared to go heavy.

And the second question is, is this sort of symptom indicative of a permanently extremely weakened tendon? These snaps/clicks I feel, does this mean I will always be at extreme risk for a bicep tendon tear if I do something heavy or do preacher curls or something? Should I be mindful and just always go very light and give up on doing heavier curls than like 25s single arm and maybe 80lbs double arm?

I've done a lot of googling but can only find information on joints clicking or on clicking at the shoulder and not the elbow in the tendon, so any insight would be extremely appreciated.

Thank you so much!