I really miss lifting weights. Gyms have been closed for three months due to the pandemic, and I can feel my muscle mass evaporating. I can do some bodyweight exercises at home, but there's no room for weights in a tiny flat :-(.

I know bodyweight is no perfect substitute and you probably already know this, but you can still have progressions of bodyweight exercise variants in a way that mimics progressive overload of weight to some extent. Check out the infographic here - http://www.startbodyweight.com/2014/01/basic-routine-infogra... - 8 types of exercise with progressively tougher variants. If nothing else it helps keeps things interesting

Buy a pair of adjustible weight dumbbells. There's a wealth of workouts you can do with just those.

I keep them in a corner of my room. Takes up basically no space.

Problem is they're out of stock everyone since the pandemic.