I remember reading years ago that the average American adult puts on 3 lbs during the holiday season and then never recovers by dropping that excess weight, so it just accumulates every year. For the people whose fitness routines and health were negatively impacted by COVID (e.g. people who had young children at home, in my experience, and people who got really sick), I think we might be seeing a similar effect. You can't get back lost time even after life "returns to normal."