Field test and ERG and Failed Field test

Yes you should not a field test on ERG mode. The idea of a field test is to test your power and you wouldn’t have to test if you knew what to put the power target at.

What should you put your FTP at? Hard to say. Did you have it set before? What did you put your target at on the trainer? How far did you make it? Now when you do it you will know you can not ride as hard as you just did. With people we coach we sometimes give them a 2 x 10 full gas workout to help determine a target to hold for their field test.

If you haven’t done one before or have really no idea what it is I would recommend just doing it today instead of the planned workout. Move todays plan workout to tomorrow. Then still have Friday as a rest day and continue with plan as is Saturday.

If you have been training and an idea of a previous FTP you have had just keep it as is. Some athletes just can tell what their FTP is and don’t need test.

The other thing you can do is look back at past data in the last 30 - 60 days. Look for you peak 20 minute power or 60 minutes normalize power and use that number.

This is how you move workouts in TrainingPeaks: