I hated the bus. Stopped taking it in 5th grade. Rode my bike, ran or walked every day. If making your kid run to school is abuse, then I guess PE would have to be as well.
Humans, along with many other species, align themselves according to a dominance hierarchy. Physical dominance is only part of the hierarchy, and will only get you so far. Competence is a much greater indicator of your position in the heirarchy.
Allowing younger children to play rough lets them learn limits and how to properly interact with others. And any schools that have limited or eliminated recess need to reinstate them and expand recess periods. Kids who are able to get physical activity throughout the day are better able to focus and less likely to be misdiagnosed wih ADHD. But I digress.