2. Holding your breath with puffed cheeks
When you perform the Valsalva maneuver, you hold your breath against a closed glottis, not against your lips with your cheeks puffed out. Don’t know what a glottis is? Not a problem, simply say the word “hick” and hold the “ck” position with your mouth at the end - you’ll be holding your breath against a closed glottis.
You can correctly perform the Valsalva maneuver with an open or closed mouth, so to see if you’re doing it correctly (and not holding your breath against your lips), try performing the Valsalva maneuver with your mouth open the next time you lift.