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Doubling up?

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.
T

TJ00

Well-Known Member
Feb 8, 2003
15
0
86
Have heard the term quite a few times (Doubling up) as a Freediving technique. Are any explanations on the actual procedures available?
Thanks, TJ
 
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