S L Ne F.
I try to do an excercise that by the end gets hard to the point where I start to lose form, but not break down or have pain. Once that exercise is no longer difficult, I increase the weight or the number of reps or change the exercise. Most bodyweight exercises have gradations of difficulty. If your arms aren’t strong enough to do a push-up from the floor (let alone 10) then start by doing pushups on an incline, a railing, or against the wall. Same is true for any exercise. Can’t run the full way? Then walk for part of it. It’s more important to do exercise in a way that’s challenging and motivating and painless, than to try and force yourself into an exercise you’re not ready for. Plus, it’s very rewarding to notice I’ve gotten stronger and can progress to a different exercise.