The mouth piece was to big.
I cut it down on the sides.<br />  And if the red one is least resistance "easy"<br />  I don't see myself progressing.<br />It is hard to do more than the repetitions they suggest.  I can only do 5 then hold and 3 to 5 more.  It is stupid hard. Hope that changes<br />For me.
Rating: 3 stars