Athlete's Calculator
The Athlete's Calculator from Stevens Creek Software lets you do computations involving time, distance, and pace (time per distance) or speed (distance per time), and also converts between various units of distance and pace/speed. Use your preferred units of distance (miles, kilometers) and pace/speed (minutes/mile, kilometers/hour).

Trailguru
Use your iPhone 3G to do more than just listen to music while you run, bike, or hike. Download Trailguru and capture your outdoor activities using the iPhone 3G's integrated GPS.

GoLearn Hiking
Ideal for those looking for supplementary personal fitness training, as well as those embarking on a fitness program for the first time. With the aid of video exercise demonstrations, combined with progress tracking, GoLearn Hiking acts as a personal trainer that is available for you wherever and whenever you need it.

Nancy Clark's Recipes for Athletes
The colorful app offers 71 recipes designed specifically to help you perform better in your next event. You can find recipes according to when to eat them, such as pre- and post-exercise, breakfast, dinners, etc. You can search for vegetarian, vegan, gluten-free, and dairy-free recipes. Each of the recipes includes information on calories, carbohydrate, protein, and fat - plus a full color photo of the prepared dish.