Every kid in my town swam and played soccer. And then later I skateboarded and did some boxing. So it's like that polling and poltour to use is thousands of repetitions allowed you to get very good at contracting. But because I also played soccer and skateboarding but didn't do any basketball, basketball or football, muscle groups like deltoids are very challenging to activate and isolate. Early development is superimposed on a genetic template that predicts which muscle groups are going to be easier or harder to isolate and train.

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