People who keep fit for a long time can keep their protein intake on training days on non-training days. This is considered with a view to the goal of increasing muscle.

But there is a problem to say.

First of all, a weight of 2 grams of protein per kilogram (2.5 at most) is not applicable to everyone. You should consider your metabolism. One or two days is fine, so the burden of internal organs is heavier in the long run.

Secondly, long-term fitness is not a long-term muscle gain, and muscle gain is also phased. Protein intake will be lower in the plan of fat reduction period. In other words, the protein you plan to eat doesn't need to be fixed.