The main reason I go to the gym is because of my dud shoulder.
If I don't go for about 10 days, the migraines start happening and I can't play guitar or drums.
Then there's stress of missing work, physio bills etc.
So I go 3 or 4 times a week, do particular things when im there and it keeps my shoulder working properly.
This is all from the years of house demolitions before I got into IT as a career.
Labouring really does wear your body out.