What’s a fartlek session for overall running fitness?

This fartlek is good for general fitness, as it subtly gets quicker without being too speed-based. Run the intervals at a pace that is ‘comfortably hard’; try to gradually increase your pace as the intervals get shorter.

10-min warm-up 4-min interval, 4-min interval, 3-min interval (with 2 mins easy in-between) Run for 3 mins easy 3-min interval, 3-min interval, 2-min interval (with 2 mins easy in-between) Run for 3 mins easy 2-min interval, 2-min interval, 1-min interval (with 2 mins easy in-between) 10-min warm-down