Volleyball in the mandatory sport class. Hated it and my class hated me for ruining their game of balls, cos anyone who ain't fat and is ungainly, must be willingly slacking. But all the sport teachers at my high school were obsessed with it. Sometimes basketball (even worse) or floorball (better) or some mixed gymnastic or athletic exercises. I don't get how I was supposed to get good grades on my 2nd try ever in anything that requires special equipment that is otherwise unavailable.