As part of 7Oaks Triathlon Club, we do a turbo training session with Paul Butler Fitness.

To make the sessions more useful, we work out heart rate or power zones.  To make this easier to calculate from our 20 minute TT (max effort!) average heart rate or power, I pulled this simple calculator together. There’s even a print button, so you can print out the results and stick to your top tube!

The training zones calculator