"It is socially acceptable to be bad at maths, but you are looked down upon if you are overweight, lack coordination or are otherwise unfit"
Yes, that is sadly often the case.
My advise if you want to change something, find acticities that are fun. Everything with water is good, if you are overweight, but it seems, you likely would not like the public swimming pool. But there are offerings for water exercises especially for obese people. Being in a group helps ignore what others think. Otherwise there are hidden lakes for example. (Or get a private swimming pool if you have the funds)
Yes, that is sadly often the case. My advise if you want to change something, find acticities that are fun. Everything with water is good, if you are overweight, but it seems, you likely would not like the public swimming pool. But there are offerings for water exercises especially for obese people. Being in a group helps ignore what others think. Otherwise there are hidden lakes for example. (Or get a private swimming pool if you have the funds)
Otherwise a (enforced) trampolin might be fun.
Good luck to you.