Too many people run marathons and lift heavy weights for me not too say them.

I don't think that increased strength and increased metabolism are great benefits now. There are few instances in today's world where strength matters, and increased metabolism is really only important if you really like food, or are a competitive food eater.

Beyond not being obese and being able to play a game of pick up basketball with the guys, I am not convinced that exercise really means anything, beyond increasing status to some groups of people.

I would simply recommend doing the type of exercises that will make your body type appeal to those who you want to impress, or get along with, that don't have a high risk of injury(unless you like impressing the risky crowd, up to you)