It is inefficient. There's an easy way to learn to pedal all the time. (Easy but you can get hurt doing it.) Set up a bike as a fix gear. Now, not pedaling while you are moving simply isn't an option. I was told many moons ago as a young, beginning racer to set my second bike up fix gear to learn to pedal correctly and smoothly. I did. I fell in love with the simplicity and purity and still ride fix gears nearly 50 years later.

Don't take this lightly. Fix gear can do wonders for poor pedaling habits but they can be a cruel mistress; as in causing instant crashes for minor mental lapses. And please don't even think about riding them on roads without brakes. Yes, popular but dangerous. Do as I was told by my club race veterans years ago - have and use two good working brakes.

Another caution - you might like it. And end up like me with half of my bikes and more than half of my miles fixed. Fix gears are dangerous. Kinda like cigarettes and heroin. Some of us can't quit.