Nike most recent bid to enter into the crowded field of wearable fitness technologies is its Nike  FuelBand , a rubber wristband that tracks user movement and links that data back to an iPhone application for real-time performance readouts. 

In a bid to further the usefulness and value of the personal technology, Nike has also opened the beta version of its NikeFuel API to developers interested in combining music with the wristband, marking the first time Nike has released an API of any kind. Developers will be able to use the API to hack together apps, platforms, and other technologies that can work together with Nike’s fitness offerings. Though the API is only currently available in a limited beta for developers who participated in the Backplane hackathon during SXSWi in Austin, Texas, the move likely signals wider API availability in the near future.