Not this, go to the source rather than Gladwell (Anders Ericsson) if you Google him a bit there's some podcasts where he talks about deliberate practice and he

Not this, go to the source rather than Gladwell (Anders Ericsson) if you Google him a bit there's some podcasts where he talks about deliberate practice and he cowrote a pop book called Peak which introduces his major findings. Definitely worth a read as Ericsson is the foremost expertise researcher in the world.