RTO is also a factor for some... when I was working full remote I had the time and energy to attend an HIIT class 4 days a week. I was in the best shape of my life.

Since starting a position that requires me in the office for 3 or more days a week, I no longer have the energy (or schedule) to attend since I spend ~120-160m in traffic. Between that and the lack of proximity to my own kitchen affecting my dietary choices, I've gained almost 40lbs in 2 years.

All of this is of course avoidable with self-discipline, but self-discipline wanes as you get more exhausted from your day.