Some of our muscles are so weak they won't respond to normal efforts, they only move when you really force it and often other muscles are engaged. Your small toe is a nice metaphor/example for other weak muscles on your body. Most people can't separate the small toe from the other four because the muscles governing its movement are weak in comparison; you end up moving everything just to move the one you want. So, one way to gain control over the movement of this toe is to make a small effort to move your little toe without worrying whether it moves or not--so that IF your little toe was strong enough, it WOULD move. The point of this is to become aware of how it feels to flex just those particular muscles. By being aware of the muscle it will build neurons in your brain for the muscles and movement you want, speeding things up a bit. If you try to do this every day, maybe multiple times a day, the muscle WILL eventually get strong enough that you'll see tiny movements. After a while you'll be in complete control. I like this method because it practices mindfulness, and you'll be training yourself not to engage the muscles of the other 4 toes--thereby killing two birds with one stone!