hi im new here and i really have some questions.i had been playing since i was like 12 and i used to play to the side off the center and i already had developed a good embochure for about like 5 years of practicing. i really began to hav problems time to time and decided to change my embochure to the center. now i hav just about 1 year with my new embochure but i get tired really quickly and my lips get swollen. im a mariachi musician and i can bearly last 2 hours. sometimes im forced to play about 5-8 hours while i cant play anymore. is it because i have only 1 year since i changed my embochure or is it a lip problem. help!!!!!!!!!! my dad just thinks tht is part of the process of making endurance ... he can play nonstop for like 15 hours and never ever gets tired!