Answer:
What comes in many varieties and can't be seen or touched, but it often makes you move?
Lovely and round, I shine with pale light, Grown in the darkness, a ladyβs delight.
Longer than a decade and shorter than a milennium
How many bricks does it take to complete a building made of brick?
What has a head and a tail but no body?
People take me on walks and I run and have fun. What am I?