all one has to do is to squeeze their firsts together gently.... always starting and going left to right - just like one does with the eyes.
It is also GREAT for helping one fall a sleep or to get back to sleep when they are awaken in the night.

....... YOU can use your feet (when sitting down) in the same way one would use their hands when in public - always starting with the left foot first, then just gently just tap away.

No - I - can't. I have a physical health problem Cerebral Palsy. if I squeze ANY of my muscles tight I go into muscle spasms and contractures that result in brokien bones.