Of course, he’s right. Click the link below for his reasons.
“Strength – as well as a tolerance for childish nonsense – is the thing we all lose as we age. Squatting down, standing back up, putting things overhead, pulling things up the driveway, loading the groceries, wrestling with the grandkids, teaching the dog who’s boss, mowing the yard, putting the broken lawnmower in the truck again: simple physical tasks we took for granted years ago are often problems for older, weaker people, as well as a source of potential injury that can be expensive and debilitating.
For most of us, this happens because of inactivity. If you do not use your muscles to produce enough force to convince them to maintain their ability to do so, it shouldn’t be surprising that they become less capable of doing it. And walking, running, riding a bicycle – physical activities whose performance is not limited by strength for even moderately active people – cannot increase or even maintain strength.”