How do you prone float for 5 minutes?!?!?

Question

I was reading through the requirements for getting through the naval officer training (something I am interested in) but one of the things it states is that you must be able to "Remain afloat face down, utilizing survival floating skills, for five minutes." and all I can say is HOW IS THIS DONE?!?!?!? Do you go 5 minutes without air???

Answer 1

You are permitted to lift your head out of the water for air. Your torso must remain in the same position though.

The key is to breathe in and out slowly and to never exhale completely. The air in your lungs will keep you afloat.

Also, remain calm and do not panic. You will exhale suddenly and sink.