How do i stop my puppy running between my legs?

My 8 week old lhasa apso is always running in between my legs around the house. Is there any reason for this? And is there any way to train him to run on one side of me? It's got to a point where he sometimes sneaks up on me and I don't realise he's there and I an close to kicking or stepping on him by accident. I don't want to hurt the little guy!