Originally Posted by
billridesbikes
But as you workout you’ll become fitter, or sometimes you get sick and need a couple weeks off. Anyway, you need to do an FTP test at least once a month to recalibrate the numbers. You can’t use a number that is over a year old. Not sure what you mean by ‘great accuracy’, because the accuracy of any given FTP test method will have some issues that influence the accuracy, but you don’t know at all if you don’t test.
Not true in the least. Training is essentially testing. You don't have to do an FTP test to do structured power training at all. You can either do a workout or hit a particular power for a particular duration or you can't. Getting got up in the minutiae of what FTP is or isn't (because hell, that's about the least exact concept that's currently popular in training terms) really doesn't matter for training or performance.