Stretching before excercise a bad thing?
Today at my Karate class we lined up as per usual and then went straight into sparring drills. After ten minutes of this I asked if we were going to stretch soon as high kicks seemed a bad idea when not stretched. My instructor told the class he had spoken to a highly qualified fitness coach who told him stretching before an activity had been shown to be a bad thing. Recent studies had shown it was better to warm up and do "ballistic stretches" which as far as I could make out involved swinging your leg up into the air like a slow axe kick. We went through the entire session without fully stretching. When I questioned my instructor he admitted he forgot to stretch the class at the end like he planned but assured me it wasnt necessary to stretch each session.
I wondered what your thoughts were on this as this is the first time I have heared of this and it didnt seem to make sense to me.