I work out two, two and a half hours a day. For 'Immortals,' it was body-weight stuff: crunches, pullups, and martial arts-based cardio.

I work out two, two and a half hours a day.

'Immortals' was very much a martial arts based training program - a lot of body weight stuff, very little in the way of actually lifting heavy weights, and a very, very low calorie diet.

I work out for an hour and a half every day, alternating between cardio and weights. I also do yoga for an hour every alternate day and swim every other day.

A large amount of constant activity will get things going. For example, training in the morning will have everything, all the juices flowing by the time you actually get to work. So, when you're at work, you've been already up for an hour or so or two hours, and you're raring to go where everyone else is still wiping sleep out of their eyes.

In my day, at 12 years old, which was 38 years ago, we worked out in summer months for two and a half hours. Today someone in that age group might work out for four hours, two hours in the morning and two at night.