Heart rate zones have been used by athletes and coaches for as long as we've had portable heart rate monitors BUT have we become too obsessed with those numbers? Mark and Heather explain what heart rate zones are, how to find yours and if you should use them for your triathlon training. Should we be relying on them or not?

0:00 - Intro
0:27 - Olav Aleksander Bu on zones
2:11 - What are zones?
2:57 - How to do threshold tests
3:57 - How to calculate your zones
5:08 - Using zones
6:14 - Zone 1
6:24 - Zone 2
6:45 - Zone 3
7:14 - Zone 4
7:33 - Zone 5
8:05 - Can we rely on zones?

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