I would suggest not letting your puppy run around in the house.  Puppies need to be trained at early ages that running is for outside.  A puppy running around in the house can be cute, but a dog who runs in the house is going to be a nuisance.  Start training these habits early so that you’ll end up with a nice calm well-behaved adult in the house.  Running around and exercise also causes a puppy or dog to have to go to the bathroom.  Have your puppy run around outside and you’ll have better chances of them pottying outside.  Running should always be an outdoor activity.