On breathing...do y'all breath out through your mouth or through your nose or a combination. I find I tend to hold my breath when I exhale through my mouth but can't completely empty my lungs with a nose exhale. I feel a lot less tired exhaling through my nose. Thanks.
I usually exhale mainly through the nose..inhale through the mouth. Like Rob said, exhale underwater..inhale over water. Makes for a more enjoyable swim:D