Rory Murray, via email
Scott Parker says:
"Interval training is something I've used in my training regime for long parts of my footballing career.
More after the break
I normally do blocks of four minutes, either on the treadmill or on the training pitch. So that's four minutes at a gentle jog followed by four minutes at a near sprint.
You should repeat this four times so that you're running for 32 minutes in total. You'll find this is something that really helps your general fitness as the season goes on.
I think the days have gone when you jog around the field for half an hour. It's more about short, sharp bursts in the modern game."