The fact that you can somewhat improve your muscles doesn't change that some people need to put much less effort in or can recover fast enough to be able to put more effort in.
Same for brains. Except we don't know a way to improve a healthy brain's performance (*in a general way, ergo a way that transfers to other tasks).
The fact that you can somewhat improve your muscles doesn't change that some people need to put much less effort in or can recover fast enough to be able to put more effort in.
Same for brains. Except we don't know a way to improve a healthy brain's performance (*in a general way, ergo a way that transfers to other tasks).