I have a hard time exercising unless there’s some type of cool technology involved. jnielsen posted his heart rate and GPS info from the Ironman Arizona triathlon race. “I used my Garim 301 for the entire race and loaded it up to motionbased.com. The GPS has the distance almost dead on. Check it out – but no cracking on my time:) It’s a pretty cool tool – I actually swam a pretty straight line!”. Links to the individual maps and data here.