So I've been forcing myself to do a male anatomy study cause I suck at drawing dudes. I've been breaking the body down to each part and just really repeating drawing them. It's helped SO MUCH I highly recommend doing this if someday you don't want to use references (or if you just want your drawings to be as accurate as possible.
Also if you're gonna try this don't get discouraged, I literally cried over the arms. It'll get better the more you try