When I first introduced a wheel to my babies (I had the omg my hamster just had babies moment not so long ago lol thanks pet shops
) and I just got em a cheap-o wheel for their monitored wheel time, they did the same thing once they really learned to get going, thank goodness I tend to give loads of bedding so loads of padding when they took a tuble, and was right there watching and to make sure no one got hurt, they learned very quickly how to slow down, sometimes they do it for fun tho I think.