Thursday Morning Riddle

I’m aerobics with blocks; I’m a marriage-formed clan;
I’m a unit of dancing; each stage of a plan;
I’m a real-number function that breaks up its span;
And the action a thousand-mile journey began.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

3 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Step

  2. Bill Says:

    STEP is correct. Way to go, Asher!

  3. Achal Says:

    Oh! Shit. He already solved it. Now I won’t get the credits..

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