doing 250 pushups day after day is dumb i will get hurt.
doing 500 stairs day after days is dumb i will get hurt
doing one ninety minutes on the bike is dumb i will get hurt.
doing thirty minutes with resistance bands is dumb i will get hurt.
but 100 pushups every other day works
and 306 stairs works every other day.
forty minutes on the bike works every other day
15 minutes resistance bands works every other day.
so i kind of know the low end of exercise i can do with out getting wrong soreness.
and I kind of know the top end of exercise that will hurt me.
the goal is to do the low end and slowly add a bit to it.
I recently saw somewhere that, two set of racers were asked to take a test in running. One group was asked to run for 20minutes and the other group were just asked to run and wasn’t given a time range. In the exercise, it was found out that, the athletes that weren’t timed did better than the ones that knew all they had to do was run for 20minutes.
That is to say, once your mind already capped it at a certain point, that’s how far you are more likely to reach.
It’s important however to know your body and I figure that’s what your post implies and yes, limits are good for fitness else, you might end up building muscles and changing your structure in ways that you wouldn’t appreciate. Slowly beating your limit though builds endurance and works without having to stress the muscles.
I am older it is joints and likely arthritis .
Today I did 102 stairs and will skip the pushups.