Your iPhone 3G knows where you are because of the built in location finding features and thus it can track your travel movements and how quickly you get there. This can help measure your runs, hikes and car and bike rides. The $3
Distance Meter Pro
by Future Apps will do all of the above and count your calories to boot. Simply enter your weight and activity type and the app measures how much effort you expend to get there and at what speed. When you're finished, you can export your activity to
TrainingPeaks, a website that offers free training program compilation.
