I was just reading a book and in one chapter it talks about how MENTAL TRAINING will get the same results as actually practicing.
This doesn't mean that you can get better at the piano if you don't know how to play the piano yet, or do the splits of you're not that flexible, or get stronger by thinking about lifting weights. It just means you can improve your skills just by thinking about it. Just imagining yourself, throwing a ball, or sinking a basket, and you get better at it.

So does that mean that just thinking could ever take the place of actually practicing?

Yeah, it does work.
I've tried that b4.

I think that you have to do both thinking and practicing, though.

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The Way We Roll

I sugest reading Toughness Training for Sports. That is a great book and talks more about that kind of stuff.

Uhh...I've never really thought about that.

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Oh the impatience.