NO ANKLING.
Most people haven't a clue as to how to properly use the technique and end up getting hurt. About 85% of what I've read in the forums from people who explain ankling are in this category. It's not worth it.
Terry, I am aware of your disagreements with Carmichael. I am not TELLING anyone to use the Carmichael effort to train for spinning itself. I like the one legged technique so you can focus on the pushing across aspect of the pedal stroke. Other than that, I see very little use for pedalling with one leg. But if you don't get the principals of pedalling, and riding outside isn't going to do it, I totally recommend going at it one leg at a time. Then go outside and ride the bike. There's nothing wrong with that.
All that pedalling with one leg stuff to develop leg power.... nah.
Koffee