Your example is just one way of exercising, though. There's no getting around it requiring some time, but you can likely do a decent bodyweight-style workout w

Your example is just one way of exercising, though. There's no getting around it requiring some time, but you can likely do a decent bodyweight-style workout without a gym membership, without a commute, using only implements you can find in your community. Some space to jog, do pushups, something you can hang from to do pullups, etc. People have been training themselves to have fairly large amounts of muscle and endurance in jail, in 3rd world countries, and plenty of other places besides expensive gyms.