Do all or at least most boxers and mma athletes cut weight before fights?

Question

I'm 6ft 1 @ 135. people close to me guess my weight at about 170. I cant imagine actually trying to lose weight. It takes all i can do to keep what i got. Its like the movie Thinner. People say muscle weighs more than fat, so I lift daily. But it does not improve my weight. I'm not even sure boxing has a weight class for me.

Answer 1

I dont get when people say muscle weighs more than fat. 100lbs of muscle is equal to 100lbs of fat.

Yes, most people fighters cut weight before their bout unless you're in a heavyweight department.

Answer 2

i say 165 to 170