This means that at no time in your life should you stop being active.

Keep using your entire body as much s you can. If someone asks for help, help them.
If ever I see someone pushing a car I ask if they need help, if they sy yes then I am pushing as well.

One of the reasons why people go to the gym is because in all other parts of their life they are relaxing, or not being what should be normally physical, and that is often because they are in an office all day, or in a classroom a lot of the day. Believe me, it is perfectly natural to want to be outside and not cooped up in a classroom. Being in a classroom is not natural, but being outside and being physical is.

If is an accepted fact that if we don’t use our muscles we lose our muscles and then as an old man we become bent-over, slow, and we look old.

My answer to avoid this is to be active as often as you can with sports, but also active in taking the long way, walking a lot, cycling, and yes also going to the gym, but also instead of paying other people to do heavy work for you, do it yourself.

Also avoid machinery if you can and do the work in the more physical work as it was done in the past, because in the past they did work that way because it was good for muscle, body and bones, and also good for the soul.