Today I did 200 squats at work. Not all at once, but in sets of 20 or 25 at a time.
Yesterday I managed to do 125 squats, and when I got home my legs felt sore. Heaven knows what my legs will feel like tomorrow morning, but I feel if I keep exercising in this way it will help in my yearly Physical Agility Test which I have to pass to keep my job.
There is also the additional benefit that it actually makes my job easier. These days when I come to a flight of stairs at work I can jog up them or jog down them with no difficulty. A year ago I could not have done that. Just walking up the stairs was an effort. Now I look forward to running up and down the stairs at every opportunity.
I even have a smartwatch which tells me how many steps I take and how much my heart has been active in a day. This is a good infants from me two exercise more.