At the very least, says Wadsworth, you should try fartlek.

They've all finished the fartlek, it seems, and are walking the rest of the way back to Iten.

This would change a normal fartlek by doing a jog, run, and a full out sprint.

Once a week, schedule an interval workout, hill repeats or fartlek.

Utilize fartlek workouts on the roads when the track is covered with snow.

Third session is easy Fartlek again, over about 5 mile not including warm up and warm down.

Some training regimens, such as Fartlek, combine both continuous and interval approaches.

Running 15 miles a week in three or four sessions, including one of intervals, hills or fartlek, should be sufficient.

Track workouts, formation runs, and fartlek runs are also a staple of the training.

The other session is fartlek over a distance of 5 to 10 mile to be fitted in when it is convenient.

Fell also told me that the Scandinavians invented the concept in the 1930s with fartlek training but that today the approach is much more scientific.

Following this line of thinking I began experimenting with mountain bike riding over well grass surfaces using some fartlek type run workouts.

It is run like Ted's Fartlek in a way, pushing on the hills and a little easier in between.

It is possible to alter the type and timing of the fartlek in order to mimic the intensity of an average basketball game.

The fartlek sessions should be your way of finding this rhythm, running bursts of 150-200m with a long stride and vigorous arm action.

Anyone for a fartlek?

Al has planned a fartlek session (stop the sniggering at the back), which combines short bursts of speed with slower stretches.

Runners can use their music as a template for their fartlek run by changing their speed according to different parts of a song.

How do I do fartlek?

What is Fartlek?

'Fartlek' is a Swiss word meaning 'speedplay'.

Swedish coach Gösta Holmér developed fartlek in 1937, and, since then, many physiologists have adopted it.

Putting fartlek runs in a workout routine keeps "muscles, tendons, nerves, etc. used in running going at top capacity."

I have just done my first fartlek session in Victoria Park, east London, and it wasn't as bad as I had feared.

After a one hour fartlek session and a one hour steady bike ride I did nothing for several hours before going for a swim at the lake.