Enrolling your kids in sports can improve their self esteem, get them in shape and help them develop a life-long habit of being active. These are some very good reasons to get them on some sort of team, yes? But there's another good reason they should get on the playing field -- playing ball as a teen can help keep their bones healthy for up to 40 years.

According to recent studies, sports like basketball, baseball, volleyball and soccer can help keep kids' bones strong well into old age, even if they don't keep the activity up. That's not to say they should give activity up as they age, but it goes to show that what you do in your teenage years can have lasting effects on your health.

So come spring, get your teenager active -- if you can, that is.