Improving as a runner includes improving both your aerobic fitness and muscular fitness (both your lungs and legs) and long hill repeats will strengthen both.

Longer hill repeats at a moderately hard effort will increase your endurance and fatigue resistance, while short and fast hill repeats are designed to improve your speed, l

Try this workout

Oxpecker launch

Some things to remember

Good form is essential for hill repeats, especially longer intervals of uphill running. 

Notes on pace

Easy pace should be a slow, comfortable pace at which you could hold a conversation with your running buddy. In terms of numbers, this will be about 1-2 minutes slower than your goal race pace; in terms of perceived effort, these should be a 3 on a scale of 1-10, with 1 being a very light jog and 10 being an all-out sprint.

The hill repeats should be done at a moderately hard effort, or a 6-7 out of 10 – your breathing will be laboured but you should still be able to speak in short phrases. Your pace will not provide an accurate indication of work on the hills repeats. Thanks to the physics of gravity, running uphill increases the energy demands of any pace, so any given pace will feel harder running uphill than it will on flat ground.

Be careful on these workouts not to start out too fast, otherwise you will burn out after the first few repeats. If you do start out too fast or can’t slow down your breathing by the time you jog back downhill, walk the next downhill recovery interval.