Can swimmers hold their breath longer that people who don't swim. what is the hypothesis?

The hypothesis would be can professional swimmer hold their breath longer than people who aren't

A hypothesis is a statement, not a question.

Can swimmers hold their breath longer that people who don't swim?

I have no idea. What do you think? The hypothesis is what you think.

I see three possibilities here:

1). Swimmers can hold their breath longer that non-swimmers.

2). People who don't swim can hold their breath longer than swimmers.

3). Average swimmers and average non-swimmers can generally hold their breath for the same length of time.

These are three possible hypotheses. There may be others that I didn't think of.

What do you think? Once you decide what YOU think, you have a hypothesis. Your next job is to set up some kind of test or experiment to find out whether your hypothesis is true or not.