Fat people are usually strong from moving their large bodies around, but tend to lack endurance. Its more impressive if they can do 5 pushups than that I can do 50, mines just cardio because I'm light, they might be pressing 2-3x my weight.
I prefer when a feedee exercises to stay healthy, they usually grow faster as a side effect. Exercise increases appetite and makes your body more efficient at using calories, specifically cardio. I read a study that showed it encourages growth of capillaries deep into fatty tissue. This can work against weight loss because if you have quicker access to fat stores but are in calorie surplus, you store excess ingested fat in your soft areas instead of around organs, which is actually healthier for your body in the long run.
The initial weightloss that can happen with a feedee is from losing organ fat, which prevents or reverses prediabetes sinces its the first stuff to get utilized. Making them healthier and more insulin sensitive, more able to store and use fat.
Kelly Kay famously used light cardio in the form of walking to get over a plateau back in the day when she was around 500lbs. She didn't gain weight at first, lost a few pounds, then suddenly started piling on the pounds. You can probably expect something similar if you are using exercise toward the same end.
A 10-15 minute walk should be enough to trigger this effect. Exercise doesnt need to be intense.
Just keeping a feedee from falling into the laziness is good, but voluntarily strength training is the ideal, they move like their weight doesn't affect them and have less health problems than sedentary thin people (based on a research paper and personal experience).
Also I'm biased because strongfat types are hot. It took me a long time to realize that all the feedees with a nice shape were shaped by the muscles under their fat.
9 months