It goes without saying, if there's a sharp pain or a soreness in a tendon while doing an exercise, stop any exercise that triggers it.
If you're using my exercise, then there's enough cross over that you can completely skip one and you're ok. Do something else, repeat another day's exercise to replace it or just skip it.
My shoulders are odd, especially the right one so there are a couple exercises I don't do. Some I used to not be able to do that I can do now no problem, and that's a result of specific muscle tone. My back was in sorry shape at one point and extra core exercises actually felt good but squats didn't so I stayed away from squats for years but I was trying them lately I've been doing squats a little and they've been fine. My back is perfect actually. But now my shoulders are weird with benchpress. It could be tendinitis or something else but it only got better on the order of 2 months so it could have been an injury that I forgot about. I'm always bumping into walls and things and forget about it. Anyway I shifted to different exercises to compensate and am still making gains in the same muscle groups without taking that specific path that my tendons don't like.
Speaking of gains, definitely looking plumper in the arms, chest and calves so I'm doing something right. My fat tends to be upper legs, love handles and belly because I do still eat a lot of carbs. That's shrinking noticeably. I have definition in my abs without flexing now so that's telling me my fat percent is going down to below 20%
So let's say I was 23% that means I lost 6 lbs of fat. Truth is I lost 10 lbs since starting the first cycle so 4lbs of that was because every diet does that free, less food, less poop, etc. So that lines up pretty well. The fact that I'm looking plumper and more defined and had gains while losing weight is a clear indicator that I lost even more fat so holy crap I might have been 25% Jesus.
Calves are hard for me so I'm going to say the lunges are helping that out since I never did lunges before.
Anyway, stay safe, don't be stupid, there's lots of substitutes, check yout techniques on YouTube and change it up when the gains start slowing down.