I'm pushing 30. I took piano at a very young age and recall being quite happy to do so, though I had to be forced to practice. I voluntarily returned to it in my teens, and again in college. I sometimes wish I had put even more into it.
Conversely, I was forced to do many team sports as a child, despite never having an affinity for them, and even today have no love for them or those memories, and consider most of that to be wasted time. (And again conversely, the physical activities that I chose of my own volition - biking, roller blading, and the like - are things I wish I made more time for in my adult life)
Children, especially teens, aren't just grubs that you have to impose your will onto. They know things that they want, and you should channel them into productive things they actually want to do.
Conversely, I was forced to do many team sports as a child, despite never having an affinity for them, and even today have no love for them or those memories, and consider most of that to be wasted time. (And again conversely, the physical activities that I chose of my own volition - biking, roller blading, and the like - are things I wish I made more time for in my adult life)
Children, especially teens, aren't just grubs that you have to impose your will onto. They know things that they want, and you should channel them into productive things they actually want to do.