Buck shoveled debris away until he hit bigger pieces that had to be removed by hand. He was in decent shape, but this was beyond his routine. His muscles burned as he tossed aside heavy hunks of wall and flooring.
My dude, we’re in the fourth book. We know what kind of shape Buck is in. No need to recap his physique every chance you get. I guess it could be worse, given that Buck is Jenkin’s self-insert character.