Hill Sprint
How to do it
Find a hill at roughly 8 to 12% with a firm surface — grass or asphalt, not loose gravel. You need 40 to 60 metres of it, no more.
Warm up properly first: 10 to 15 minutes of easy running followed by 3 or 4 build-up strides on the flat. From a standing or rolling start, drive hard up the hill for 8 to 15 seconds at maximum effort. Lean forward from the ankles, drive the arms aggressively, lift the knees, and push all the way through each stride.
Then walk all the way back down and take 90 seconds to 2 minutes before the next one. Four to eight reps is a session.
Why it's good for runners
In those few seconds you produce forces nothing else in a training week produces: peak fibre recruitment, maximum tendon loading, explosive power. The gradient limits your top speed to roughly 60 to 70% of flat sprinting while the muscular effort is equal or greater, which is why this is the safest way to train at maximum intensity.
Common mistakes
Going again before you've recovered. There is no cardiovascular target here — if you're winded at the start of a rep, the rep is wasted. Running for 20 seconds or more, which makes it a hill repeat rather than a hill sprint. Folding forward at the waist instead of leaning from the ankles. And pushing through a strain or a tweak — maximum effort demands a healthy, warm body, so stop at anything sharp.