+1 on the boxing part. My problem is more about stamina and cardio than it is about reflexes. I do see the reflex problem so when going against a couple of weight classes below myself, heavier people tend to be a tad slower anyways. But then I reached a point where the younger folks tend to go easier on me, not sure if I like that. Not that I train half as much as I wished I did, Covid really put a dent into that...