What do you call people who are constantly moving [i.e., "in motion"]?
Solution 1:
Restless, bustling, fidgety, fidgeting, antsy (informal), "in constant nervous motion", "flitting from place to place like a dying bluebottle"(informal), "twitching like a junky in need of a fix" (extremely informal).
Solution 2:
Are you looking for the word "fidgety"?