Marathoner Paul Whitehead goes on training runs with a few necessities: identification, house keys, a digital radio, gel packs of the energy supplement Lucozade--and his Blackberry.

Though Whitehead, the 38-year-old head of business development for Channel 4 television in the U.K., could use the phone for work purposes, he actually deploys it to track his speed, distance and pace with an application known as AllSport GPS. The program, which is downloadable for $5.99 US a month, uses the phone's built-in Global Positioning System to monitor his location and movement.

Whitehead credits the application with helping him run more efficiently and shave 16 minutes from his 2007 time in the London Marathon. Last year he clocked four hours and 18 minutes.

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