Dr Oz: Obsessed With Fitness Trackers

Do you own a fitness tracker? Know someone who does? Americans have spent more than $1 billion on fitness trackers ever since they became available, but do they really work? Dr Oz asked journalist A.J. Jacobs to be his human guinea pig and find out. A.J. talked to several people who said they loved the trackers, and many even admitted they were obsessed with them!