5'10 and 160 here....consider that I started at 136 two years ago! I was scary skinny. My metabolism is super high.
Oddly enough, drinking beer made me gain (good) weight because it helps slow my metabolism. I don't drink a lot, maybe a few craft beers a week. My waist is the same size, but my legs no longer fit into my old pants. Clothing is almost as expensive as modding cars.
I go to the gym 4x a week, and for my off days I play league basketball Wednesday nights and golf on Saturday and Sunday (I walk, no carts!) when the weather is good.