Most boys who have played sports have had coaches like this. I remember being worked so hard at practices in high school where I would feel the world spinning and couldn't walk straight. As far as yelling goes, it is fine with me. I have a 6 year old who is karate and his class is yelled at regularly. The sensei has grabbed kids by the ear and put them in the corner for not listening. It is usually always about discipline.

thanks guys