I think push ups and running are good reminders of mistakes, when used correctly. Yelling at kids just doesn't make sense UNLESS they are just not paying attention. The only time I yell is when time is wasted (silly mistakes, not paying attention, TALKING TOO MUCH) but this must ALWAYS be followed up with THE ANSWER. If its the same mistake, the student probably doesn't know its WRONG. This is where TEACHING comes in. In my first year of marching junior corps, I got stronger, not better. I learned how NOT to teach that season, and went elsewhere.