Functional Threshold Power (FTP) is the maximum effort that a person can maintain for 60 minutes.
This means that if you have a FTP of - say - 200, then this is the maximum amount of watts that you will be able to sustain for an hour.
Your FTP can be measured by doing a 60 minute all out effort on the bike, but it’s more common that FTP is calculated based on FTP tests of 20-minutes or even 8 minutes.
To calculate your FTP with a 20 minute test, simply go all out (after a proper warm-up) for 20 minutes and measure the average power pushed in the 20 minutes. Take 95% of this number and you have a good estimation of your FTP.
All training within VirtuGO relies on knowing your FTP, so it is a good to do regular FTP tests throughout your season (every 4-6 weeks is recommended). VirtuGO has free FTP tests that also ensures that you do a proper warm-up before your test.