What is the proper breathing technique while working out?

Question

In through the nose and out through the mouth or in through the mouth and out through the nose?

Answer 1

In through the nose. The nose contains hairs and structures that warm, filter, and moisten air.

Answer 2

in through nose and out through mouth. when lifting weights, breathe out while lifting, and breathe in during resting phase

Answer 3

in through the mouth and out through the nose

If you are referring to weight-training, then you should also be exhaling during the positive movement (ie lifting, pushing etc the weight), and inhaling during the negative movement