this at www.runnersworld.co.uk/heartrate)• 15 minutes at 80-85 per cent of your maximum heart rate• 3-minutes easy spin• 15 minutes at 80-85 per cent of your maximum heart rate• 10-minutes warm down at 60-70 per cent of your maximum heart rate

maximum heart rate (MHR - calculate this at www.runnersworld.co.uk/heartrate) followed immediately by a 15-minute fartlek run at 65 to 85 per cent MHR. • A 20-minute fartlek cycle at 65 to 90 per cent MHR followed by a 10-minute fartlek run at 65 to 90 per

increase this section of the session to 8 x 75m (15-20 seconds rest) and later to 15 x 50m (10-15 seconds' rest)"Learn how to swim with the most efficient stroke you can. That way you'll be able to hold the stroke for longer and you will become faster

m.For example:> 20-25 x 100m, 15 seconds recovery> 12-16 x 150m, 20 seconds recovery> 8-10 x 250m, 30 seconds recovery> 5-6 x 400m, 60 seconds recoveryTry to keep a consistent swim stroke. As you progress, reduce rest intervals before increasing pace