A crucial part to my training programs is the ability to accurately track my sessions and races with useful metrics, both in real-time and post exercise. My main weapon of choice is Garmin's flagship triathlon specific watch, the Garmin 920XT.
The 920XT has all the features you could want for all three discipline, it measures heart-rate (HR) for running and riding, speed/pace for all three, laps and strokes for swimming, cadence for running and RPM for riding. As well as acting as a regular watch and showing your time.
These tools are incredible useful, if you understand them. For me, a lot of time has been spent in understanding how my body functions under different conditions, essentially to work out my maximum efficiency for any given distance or event. Garmin has a great website that is bundled with all their GPS and tracking devices, Garmin Connect, that helps you to analyse the data and develop your own peak performance ranges.
The best part of the 920XT is the 'Triathlon' mode, it runs the watch through the three legs at the push of a button, and includes transition times! So now you can easily move for one even to the next, getting accurate times and be able to pace yourself properly. This function is particularly useful for long distance events when keeping a close eye on your power output is vital.
The 920XT does have an optional 'quick-release' kit that can be purchased separately to detach the watch face from your wrist and attach it a bike mount. I don't personally use this as I us a Garmin Edge 510 on the bike leg, I prefer the larger screen and ability to view more metrics simultaneous without having to take my hands out of the most aero position to touch the screen.
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