Ever since I increased my BP's feeding schedule due to my revelation that he wasn't getting enough nutrients, he both feels denser all around and stronger when he grips me around the arm. Do they increase muscle mass relatively quickly? Note that it's only been about 2 weeks since he started feeding more. Before this, he felt soft(but still strong).
He's 3 months old, and currently fed 2 adult mice weekly. He poops regularly, so I know it's not condensed fecal buildup.