I love to work out. How about you?
I know how good it is, but I can't get a good routine down.
A long time ago people considered fitness to be the ability to carry out your day's duties without getting very tired.
It's unfortunate that there are so many jobs now that don't involve any physical work.
I agree, manual labor was the primary form of completing physical work, so nowadays people try to make up for the lack of physical jobs by exercising.