Not at the expense of academic study, but the actual school day should be longer and accommodate 1hr or more per day dedicated to P.E. and sport.
I believe they call it lunch time. It wasn't exactly unusual during spring/summer/autumn when it wasn't raining to eat lunch on the picnic benches then 15 or 20 minutes later, go up to the football pitch and play for the next 45-60 minutes.
I know its not the same as a dedicated PE lesson but it is not physically possible to work that into every school day. Sure you could make everyone do it at the same time but do you honestly think you can get maybe 1500 students (assuming 300 and yr 7-11) to do PE together? No school would have the funding and none of them would get any attention at all.