Answer:
You row in one while you float.
Ambitious people will climb the social version of this contraption.
What occurs four times in every week, twice in every month, only once in a year but never in a day?
It weighs next to nothing but no one can hold it for long. What is it?
How can a pants pocket be empty and still have something in it?
I am your mother's brother's only brother in law. Who am I?