basketball, piano, soccer, dancing, drawing, learning a new language, ice skating, singing... a person who gets stronger and stronger at any one of these things does so through the force of will, by working even when s/he does not feel like it, even when the work does not come easy.
when i see someone who is really good at something, i remember this. talent and skill are a direct product of work. if you are great at juggling, it not because you were born with this ability. it is because you spent hours and hours dropping balls, lots of time juggling even when it was difficult. thinking about work as the 