I see it a lot on Chins and Dips where I am able to move a lot of weight for a desired protocol of reps/sets, but in moving the load, I feel like I'm going to injure myself. It's hard to quantify but I'll give it a shot. Using Chin-Ups as my example, I can move a good amount of weight, last week BW+45 for 5x5. Lifting is often painful but getting strong often rewards you with a heightened pain-tolerance. That said, do you ever feel that sensation that pulling harder will rip your tendons off the bone? I was doing Chin-Ups for BW+50 for 5x5 but on the 4th set, I got that "tendon strain" feeling and called it, to be safe. I knew I could finish all the reps, but I don't want an injury. What do you do when you know you are strong enough to do your lift, but you get that sensation that you will injure yourself in the process? Chins have that ability to let you move more weight as long as you just pull harder, but you can end up hurting yourself. Is there a weak link in there somewhere? I see two solutions. Change a rep range, or deload down to a less strenuous weight and work back up, to hopefully fill any holes. I'm not complaining, I just need perspective. Also, I find that not doing those "grinder" reps on my presses keeps me from burning out, but can one make strength progress without doing those grinder reps? Does the lift fail when the bar slows instead of when form breaks or the bar cannot be locked out? What I mean is usually I will consider it progress to complete all reps, even if the last ones are a war, thus possibly damaging myself and requiring longer recovery. Would progress still be met if a lifter didn't work much beyond the weight that slows his lift speed?