You should be careful with this, because if you hold it for too long, you may end up passing out! There is actually a maneuver called the Valsalva maneuver which occurs when a person tries to exhale forcibly with a closed windpipe so that no air exits through the mouth and nose. This maneuver impedes the return of venous blood to the heart, and can also dramatically increase blood pressure. So it should be avoided.
The proper way to breathe while resistance training is to inhale as you’re bringing the resistance back to its resting position, and exhale as you’re working hardest against the resistance.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.