Yes this thread has the potential to be taken the wrong way... I think! But I was at a concert last night watching a top band, and many players were puffing their cheeks out frequently whilst playing (not in loud sections mainly either!?), and I just wanted to check views on the matter. I think it is necessary in circumstances when your dropping down a huge interval to a low note, or playing pedal notes and need more air, but is it good for playing etc? Should it be done?