I've always hated PE. The only people who liked it were the sporty ones anyway, so it didn't make people fit. If anything, it made me feel like crap and hate the idea of sports even more. Because for some reason being good at sport made a kid "cool" but being good at any other subject like maths, science, history, etc made them "uncool". And I was a smart, if unfit, kid - naturally, this made me completely worthless to all of my comrades.
Even if you have friends to team up with, anyone who can't pull off a triple jump trampolining flying kick whilst playing football after a measly 12 laps of the field can just say goodbye to being anything but the butt of every joke for the next fortnight.
If you want your kid to be fit, take them to a club where they can actually have fun. Don't stick them in a pair of shorts and make them run around for an hour to amuse all the kids who do sports in their spare time voluntarily.