I am a month into my first Fascat plan and love it so far! Just curious as I move outside if I should do a new FTP test? I was using the same powermeter on the trainer as I have a Stages crank on my bike.
What plan are you on? Stick to the plan for now. At the end of you plan there should be an FTP test. If you can take it outside that is fine… find an uninterrupted section of road that allows you to complete your test without variables such as stop lights/signs, cars… etc. Some people prefer sticking to the same place where they did their original test to keep it consistent. So, if you did your first test on the trainer then you can stick to the trainer. Otherwise, outside is fine!