The #2 and #3 Health app on the iPhone are for those who track their activity– running, walking, biking, etc. The #2 slot is held by Nike+, and #3 by RunKeeper.
FitnessKeeper, Inc. is the company behind RunKeeper. They’re based in Boston, and were founded in 2008.
Today they claim 17 million RunKeeper users in more than 200 countries all over the world– and to date the app has only been in English. More