I'm 5'7". I've had the same body since mid high school. I weigh ~145lbs or so. I'm skinny and I try to put on muscle and it doesn't really work :lol. Guess I can't complain though as I'm skinny.
I love my body though, few quirks I wish I could fix or being an inch taller, but on the whole I can't complain.
5'9" and 145lbs too
so hard to gain the right weight
Arms and shoulders aren't big enough, legs are fine. It also lacks some raw strength, motor skills and coordination, probably because I hated sports and exercise when I was a kid and during all my teenager years.