Comment by KETHERCORTEX

It's regulated by excitatory and inhibitory neurotransmitters. Former start and support the actions and thoughts, latter prevent or stop them. It's more complicated than that, but this explanation good enough for quick summary. And it's not only about the actions we think about, but also usual body function

> some level of learning or skill training that's possible to change your amount of laziness or drive

There are also things that don't require training. Music with tempo above 90 BPM (or better above 100) temporary increases the amount of excitatory neurotransmitters.