My dd has Karate, piano, and gymnastics. The only time I have to push her is when she is on the computer and doesn't want to leave. As for piano, if she has not played much during the week and the teacher asked her if she has practiced, she will tell her "no" and my dd doesn't like when she does something wrong - so that motivates her to practice more. I agree it all depends on the kid. Some need extra diversion to practice time and some just gravitate towards it.