Q...my swim buddy was using one of those yesterday.....he used it during a kick set with no board.....He also tried it when he was pulling and not using his legs.
Both times he said that the no breathing thing was a bit awkward to get used to, but it did give him chance to work/concentrate on his form. Especially when pulling and having his legs supported with a pullbouy.
I know this did not really help, but that is all he said about it.
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