i'm not really a big gym guy, my activity is largely functional, although sometimes i'm fudging it (been taking a large box of stuff on a walk, for example)

there's some newer science showing artificial loading of weight will lead to a reduction in bodyfat, so i've been wearing a weighted vest. between that and walking a lot, i have lost a lot of bodyfat but also built substantial muscle because... i'm heavier

so maybe something like that could help you get workouts in?