@Gloersen uses a SlackBlock made by SlackBow and he recommended it to me. The product video suggests reaching a point where you can balance on the device for 2 minute intervals on each foot. With practice, your motor system takes over and you can do it. "Muscle Memory" is actually "Motor-System" memory where the muscle movements to stay balanced are no longer driven by the brain - the nervous system in your legs takes over - your balance, leg strength and reflexes are developed.
@Gloersen and I found we both had the idea of converting it into a 2-foot balance tool in slalom skiing position, though he did it with a different design.

With this modification, the front and back have independent compression, so you can also move tip down, like in your pre-turn and then neutral or back all while balancing. Instead of 2 minutes on 1 foot, you can do 5 or 10 minutes on 2 feet . . . . after weeks of practice.
I am in M9 and now. . . when my wife challenges me to a some yoga position contest balancing on 1 foot on the kitchen floor, we stop because of boredom, not because I can't balance.
- replace the original Velcro sticky tape for the longer platform
- heat the original velcro tape before removing it from the foam to prevent damage to foam
- varnish or epoxy coat the wood so Velcro sticky tape will adhere
- Yes at $70 its an expensive piece of engineered rubber foam
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I gotta credit Chelsea Mills for the Slackblock inspiration.
Now pull the bindings off your ski and wear them while balancing on your Slackblock mod. It's very enlightening.