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> Your muscles are already "developed" they genetically know what they need to do. You are not the first one to do this. Every human and all your ancestors did this it's obv when you put in "effort" it works.
> This is why it is hard with psychic abilities because probably most of your ancestors could not do this at all. 
This makes a lot of sense.
It it possible to 'download' or otherwise integrate this genetic information from a foreign source? Spirits or alternate realities or something?