Yes, getting in shape was a big factor for me in FIREing. I've always been pretty fit (have no trouble working out every day) but wanted to do more, and more importantly, spend more time cooking and figuring out that side of things. I've always been horrible with meal planning, grocery shopping, etc. We tended to eat out A LOT. There have been times in my life when I've been working a lot and eating out 3 meals a day! Probably the majority of my working career was like this. So, I have a lot of work to do in this area.
So far I've gotten a bit better, I've been tackling one recipe at a time, and only dinners. Lunches are usually simple salads and bread. I sometimes do large batches of soup, but have to be inspired by a new recipe or ingredients that I need to use up that happen to say "soup!" Eg. leeks and potatoes. I definitely need to develop these habits more and do more meal planning and batch cooking. I also snack a lot since I'm home all the time. I notice I'm stress eating more during covid.
Workout-wise - I try to do 2 a day (one in the morning, one in the afternoon.) The morning is generally yoga, and afternoon is cycling and/or weights. Total workout time could be anywhere from 10 minutes to 2 hours a day. As long as I do some sort of movement every day, I'm happy.
I haven't really lost weight since FIRE but that wasn't my goal. I'm mostly aiming to feel good in my skin and stay strong, fit, active, and pain-free. If I cut out the stress-eating and snacking I could easily lose 10-15 lbs... but, I am giving myself a pass as I don't think I'm at an unhealthy weight and I am not interested in 'dieting.' Another factor in being healthy IMO is learning to be more self compassionate; I'm not going to beat myself up about snacking and gaining a few pounds during a pandemic.