Weight Issue

Hey guys quick question.
My YML (intact) is just over two years old. He has the blocky head of an english but is a little taller than traditional english labs.
Anyways, he is all muscle. Like super muscled up, but has not a lick of fat on his body. His ribs show when he moves.
No problems with eating at all.
Am I a little too concerned because my other labs have always been too fat in the past? Or is this something I should be concerned about?

Purina 1 food. Twice a day a little more than a cup.
He gets a lot of exercise through training.

If you think he's too skinny up his food a little.

Energy level good?
Stools good?

I feed my working lab 1 - 1.5 cups twice a day depending on how hard we've been Training or working. However, the food I feed is very high in calories with no fillers. I adjust a little depending on how she looks.

Energy is always super high. Stools are normal.