Former pro free diver Mike Maric says "yes". And not only in term of sport proficiency, also in your whole life's moments.
"Science shows us it’s not physical, but mental – apnea technique is really important, but we also know mental is really important! My students really learn how to improve the mental conditions and discover new limits inside of themselves!"
"Everyone in the world can benefit from better breathing techniques! Over the last few years I’ve been working with many athletes from different disciplines – beginning with triathletes, but now including martial arts masters, fencers, and more. I’ve even helped an oncologist who uses the techniques with his cancer patients."
Read Mike Maric interview here