This is strictly my opinion, but I'd say it's a good idea for any athlete to make sure they get enough calcium and or dairy in their diet.

I don't know how much of it is genetic and how much is related to the amount of milk I drank growing up, but I've never broken a bone. I played soccer for several years, inline hockey and ice hockey all throughout my teenage years, football throughout middleschool and high school. I grew up like a lot of guys.... jumping bikes off of the biggest ramps I could make/find, climbing trees, jumping off rooftops, etc. I had an older brother that out weighed me by 50 pounds or so the majority of my life that I got into fights with all the time.... the point is that I should have broken half the bones in my body at one point or another but the worst I've ever had was a sprain.

I grew up drinking around a gallon of milk every day. Genetics or dairy products? I'll never know but I'd say that extra calcium is a good idea (as long as your body can process it... kidney stones are a bitch if your kidney's can't handle the extra calcium). Not to mention the added protein that you get from dairy products...