You don't need to go to a gym, But you do need to workout. Push-ups, sit-ups, and buy a curling bar with some weights--nothing crazy. Do a couple of sets of presses, some curls, and two other types of weight lifting exercises consisting of what ever else you want. Do it fast, and a lot of reps. 3 or 4 times a week is enough, and once you get into it only takes 20 - 30 minutes. Also, walk fast; really fast, and run up…
That's impressive. I'm early 40s and have found doing this kind of exercise really beneficial recently. I think push-ups are great for posture and all round conditioning. I could barely do 10 in a row a few years back, but now do 60-100 over 3 sets a few times a week. I also do kettle bell swings and maybe some sit ups and this seems to complement the other exercises I do really well. Like you I like to do lots of wa…
Btw: protip, I don't count to 70 or 60 and usually not even 40. I'll typically count to 30; than either just additionally count to 10, or more often just to 5, and than add the sums as I go--but then reset to the lesser count as I continue that set of push-ups. A great psychological trick, at least for me ;) .
GL!