it is much easier to create and customize my own workouts using 9 coggan ilevels. Because I want to create workouts by %FTP, not by watts. That way once your FTP improves, you dont have to edit those workouts again, so your workouts are reusable! After all 9 options in %FTP(9 coggan ilevels) is better than 7 options in %FTP(7 zones) for creating workouts(especially when you want to create SST workouts). So far 9 coggan ilevels is only available on edge820, not on GCM.
Any advices?
thanks