Every day a different muscle group. That’s what it takes to train muscles. Train them to become larger and more powerful.
Training the same muscles within 24 hours has a detrimental effect. The muscles need a day to restore. Training within the timeframe the muscles require to rest has an adverse impact. It makes the muscles smaller or less powerful.
What is true of muscles is perhaps also true of the brain? Provided that excessive use leads to cramps, how does one train the brain?
What’s the ideal balance between doing something every day to become better at it and resting sufficiently, again, to become better at it?