Exercise increases muscle protein synthesis and muscle protein breakdown, resulting in a net positive balance.

“how does how does resistance training and and training in general change the way the muscle responds to amino acids so exercise increases muscle protein synthesis also uh increases muscle protein breakdown but it increases muscle synthesis to a greater extent than it increases muscle breakdown so net balance becomes better that's without food intake if you throw protein on top of that then breakdown is inhibited to some extent and protein synthesis is further increased allowing you to adapt and to recondition the muscle to what you're aiming for”