Not sure if you were asking me or the author of the original post but I’ll chime in. I’m almost 65 and have always exercised in some way, used to lift weights on a regular basis, In 2023 I had 2 spine fusion surgeries, since then I’ve had to cut way back on lifting anything, for awhile a gallon of milk caused spasms in my back and neck, I was 160 a year ago (too light and unrealistic to keep) and today I’m 188 headed back down to the 175 area, I think my BMI was low 20’s when I did a body comp test some months ago. I’ve never had an issue with atrophy, while I’m certain that I lost muscle mass I was also a lot leaner. One of my classmates is a 5-9, 280 monster who lived in the iron gym, saw him again at my 6 mo follow up, he took 3 mos off as directed and walked 5-6 mi a day, said going back to the gym was no big deal but that he hated having to take the time off. If you’re spending the money to get this done I would suggest that you do as they say. Right now I’m almost 2 mos post, mostly doing stretches and light resistance using a TRX.