Manchester United striker Wayne Rooney admits manager David Moyes has brought a new intensity to training.
United's players are still getting used to Moyes's methods and Rooney revealed that there is a new fitness regime.
He said: "The training is different. There's a different style and thinking he wants us to play. 'It's a mixture of things but I'm happy and enjoying my football. Hopefully that can continue.
"We've done a lot of different types of training - a lot more longer running, quicker running and sharper running and I feel that's really benefited me. I feel as fit as I've ever done.
"I had a couple of injuries pre-season, but I feel great and in good shape."
