Tumble turns with snorkel

I spent some time today trying to teach myself to tumble turn with a snorkel. I can tumble turn fine. I can swim with a snorkel fine. When I try to put the two together, I repeatedly half-drown (and frustrate) myself. Tips?
Parents
  • When I first got my snorkel I had to remember to inhale just before each turn and then exhale a minimum amount of air out my nose while upside down so I'd have a reserve of air after the flip to clear my snorkel. Took me a little while to get used to it.
Reply
  • When I first got my snorkel I had to remember to inhale just before each turn and then exhale a minimum amount of air out my nose while upside down so I'd have a reserve of air after the flip to clear my snorkel. Took me a little while to get used to it.
Children
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