Answer:
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
What do you use to hoe a row, slay a foe, and wring with woe?
Just head and foot yet never tires of dancing.
What can be measured but not seen?
Don't do this in the shallow end.
What is always coming but never arrives?