Shaman Breathing

[BornToBe]

I've tried this technique twice. And the longest time I was able to do it was 5 minutes. After that I feel I'd say a strong resistance and it's really hard to keep op.  I just give up . 
Did that happen to anybody here? Is it ok having that kind of resistance ? Should I start slowly and add let's say 2 minutes every day?
Thank you!

[NoSelfSelf]

@BornToBe I couldnt do it for 1 minute at first yes its a process you built up with comfort just like a gym routine...