Athletic performance monitoring systems include components for sensing performance data and/or displaying desired information to users. Electronic interface systems facilitate transfer of the data from the performance sensing system to a display device, e.g., to enable the display of athletic performance data on an electronic display device, including conventional electronic display devices that are known and commercially available (e.g., cellular telephones, PDAs, pagers, beepers, MP3 or other audio players, radios, portable televisions, portable DVD players, other video playing devices, watches, etc.). The sensing systems, as well as any data transfer systems associated therewith, may be included as part of an article of footwear, an article of clothing, a piece of athletic equipment, or the like, or even included as part of the interface device.