Agreed, maybe it would be more clear to take out "just" and emphasize that the brain is a muscle.
> practice of a specific mental skill has little influence on other mental skills
Care to elaborate on this? I'm trying to imagine what you mean here.
> practice of a specific mental skill has little influence on other mental skills
Care to elaborate on this? I'm trying to imagine what you mean here.
Instead, maybe emphasize that the brain is similar to a muscle. Speaking metaphorically could be confusing to some.