Long exhale encourages heart into bradycardia or slow resting rate....so does immersing your face in cold water prior to diving, take your mask off and hang on the surface with just your snorkel in and do your 3 minute breathe up prior to going down....also you can try the Performance Freediving warm up .....best I can remember goes like this....
Pull down your anchor rope to 15 feet, stay there til you feel the urge to breathe, surface ....3 minute breathe up. Then pull down to 30 feet, same thing , wait til you feel the urge to breathe, come up.3 minute breathe up again. Then do a negative.....I.E. passive exhale at the surface and swim or pull down 30 feet.....it will feel a lot deeper as you'll be compressed and feel like you're down at 60+ feet.Stay down 'til you need to breathe(..won't be long! ) and come up....
Most of us are so impatient to get hunting that we go fast and don't relax and it takes about 2 hours of diving before we get our best breathhold. If you can take the time to do this type of warmup you'll achieve your max breathhold times much earlier in your day. Time spent relaxing and breathing at the surface is actually time ''invested'' in your next dive and allows quiet observation of your fellow reef dwellers!
Bones
Pull down your anchor rope to 15 feet, stay there til you feel the urge to breathe, surface ....3 minute breathe up. Then pull down to 30 feet, same thing , wait til you feel the urge to breathe, come up.3 minute breathe up again. Then do a negative.....I.E. passive exhale at the surface and swim or pull down 30 feet.....it will feel a lot deeper as you'll be compressed and feel like you're down at 60+ feet.Stay down 'til you need to breathe(..won't be long! ) and come up....
Most of us are so impatient to get hunting that we go fast and don't relax and it takes about 2 hours of diving before we get our best breathhold. If you can take the time to do this type of warmup you'll achieve your max breathhold times much earlier in your day. Time spent relaxing and breathing at the surface is actually time ''invested'' in your next dive and allows quiet observation of your fellow reef dwellers!
Bones