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Hey there,

This tip Fran Rose (who's a qualified No Bubbles Freediving Instructor, & AIDA Judge) gave me. Me personally I noticed an improvement of over 30 seconds in my spearfishing dives before I feel uncomfortable.

Before you dive breath up as normal, (Long slow full breaths through peirced lips like you're trying to wistle).

Take a full breath (like you're about to dive) and get face down in the water, close your eyes and just listen to the silence for 30 seconds. While doing this I try to concentrate on my heartrate tell myself to slow it down.

Exhale, then do another full breath up (as above), then off you go for that dive.

The 30 second static helps get me in "the zone" and also seems to help trigger a stronger dive reflex before my dive, aswell as getting my Heartrate under control.

Like I said it made a difference in my diving so give it a try and let us know how you get on.