>Round up as many students as possible whose grades are being affected by said coach
>go to front office with large possy of disgruntled students
>demand to speak to principal or a counselor
>get other students to testify that said coach is loving up your grades
Unless you're like jogging a mile in 16 minutes and you can only do a pullup when there's a twinkie above the bar, it shouldn't be difficult to get an A in gym. Gym is like the class where you START to break a sweat, have fun, learn some good team games, and then pat yourself on the back for an easy A.
If a teacher is being a stuffhead to one student, typically nothing happens. If an entire class marches into the principal's office saying "Coach richardweed is giving all of us 60s on our fitness exams even though we're all busting our asses for him."
Or at least that has worked in my school system twice when we had some REEALLLYY bad teachers lol