How to run hills: hold the effort, let the pace go

Should you run hills by effort or by pace?

Run hills by effort, because a climb changes the price of every meter: hold your flat pace uphill and you pay far more per minute, so an easy run quietly becomes a hard one. Hold the effort instead, and the slower pace is simply the correct number for that ground.

Pace is a good guide on flat roads, where it is stable and immediate. On a hill it stops describing effort: your watch says you slowed by a minute per kilometer while your heart, lungs and legs work just as hard, or harder. You train effort, so hold effort.

It matters most on easy days, where three short climbs at flat pace can each push you well into Steady or Hard. On hard days it protects the session: a rep that opens with a climb at goal pace can leave nothing for the rest.

How much harder is running uphill?

Much harder than it looks: in the classic treadmill study by Minetti and colleagues (2002), running cost about 70% more energy per meter at a +10% grade and more than two and a half times as much at +20%. Downhill, cost fell to its lowest at about −20%, then rose again on steeper descents.

Two cautions. These were experienced mountain runners, unusually economical downhill; the authors note their downhill costs were some 40% below earlier figures from sedentary people. And the numbers are per meter, not per minute. Because you slow on a climb, cost per minute rises less steeply, and that is why slowing is right: it keeps the cost per minute, which is what you feel as effort, near its flat level.

Gentle grades count too. On a 7% treadmill grade, Padulo and colleagues (2013) found metabolic cost rose 53% over the flat, while step frequency rose 4% and step length fell 4%. A grade that looks modest from the bottom is not modest for the body.

What is the best uphill running form?

Good uphill running form is short, quick steps, an upright body that leans slightly from the ankles, and arms that drive back rather than across. Runners shorten their step and quicken their cadence on climbs without being told, so mostly you let that happen, stay tall, and stop forcing a long stride to hold a pace.

As slope increases, step length and flight time shrink and step frequency rises, in elite and amateur marathoners alike (Padulo et al., 2012). A review by Vernillo and colleagues (2017) describes the same pattern: higher step frequency, a shorter aerial phase, and more time with a foot on the ground.

Cadence (steps per minute) mostly looks after itself. Snyder and Farley (2011) found that on gentle slopes of about 5% up and down, runners' energetically optimal stride frequency barely changed, and preferred frequency stayed close to it; straying far from it either way cost more. Shorten the step until the effort settles, and leave the rhythm alone.

• Look up. Eyes a few meters ahead keep the chest open and the head over the hips.
• Lean from the ankles. The whole body tips forward together; folding at the waist closes the hips and shortens your breathing.
• Drive the elbows back. On a steep climb the arms set the rhythm, and the legs tend to follow.
• Crest and continue. Most runners relax at the top. Hold the same effort for a few steps past the crest, then let it settle.

Why does my heart rate keep rising on a hill?

Heart rate responds to a change in workload with a delay, so it keeps rising after a climb begins and often peaks near the top or just past it. On a long climb it drifts up even at a steady effort, which means chasing a number on a short hill slows you down for a spike that was already on its way.

Judge the start of a climb by breathing and feel, which respond almost at once, and use heart rate as a ceiling on longer climbs. If it sits well above your Easy range for minutes on a long hill during an easy run, walk. On a short rise, keep the effort honest and let the number catch up, then fall, on the far side.

How do you run downhill properly?

To run downhill, take short, quick steps, let gravity carry you instead of braking with your heels, and keep your body perpendicular to the slope. Your heart rate will drop, and that is fine. The real cost is muscular: braking work that loads the front of the thighs and causes soreness, especially if you rarely run downhill.

Downhill, your muscles lengthen while they resist: eccentric work. A narrative review by Bontemps and colleagues (2020) describes downhill running as a standard way to study exercise-induced muscle damage: lost strength, raised blood creatine kinase, and delayed-onset soreness. It found the most effective way to limit that damage is prior exposure, known as the repeated-bout effect. The least practiced tended to suffer most.

So downhill running is a tolerance you build, not something to avoid. Add descents gradually, short and gentle at first, and expect sore quads after a hilly race you haven't prepared for. Over-striding puts the foot out in front, which turns every step into a brake; a shorter, quicker step keeps it under you.

How do you add hill training without wrecking your plan?

Decide what each hill is for: a hilly easy run teaches you to hold an effort over changing ground, hill repeats are a hard session with the climb as the rep and the way down as the recovery, and paced intervals belong on flat ground. Mix the three by accident and hills start to feel like failure.

1. 01

   Easy runs on rolling routes

   Hold Easy on every climb, walk the steep ones if needed, and don't win back time on the descents.

2. 02

   Hill repeats as Hard work

   Short climbs of steady gradient at Hard, with a walk or very easy jog back down. The grade raises the effort without the speed.

3. 03

   Flat ground for paced intervals

   If a session asks for a pace, run it where pace means something. A loop with one long hill still works if the hard blocks land on its flatter stretches.

4. 04

   Descents in small doses

   With a hilly race ahead, add short, gentle descents weeks before it. The legs adapt to descents, but only after meeting them.

A joint or tendon problem that hills aggravate, or symptoms out of proportion to the effort, is a conversation for a clinician, not a training article. Our health disclaimer explains what this journal can and cannot tell you.

How does Gears coach hills?

Gears coaches hills by effort on every outdoor run, with no signal needed. It reads the climb from the barometer, speaks when a real hill begins rather than at every rise, and never scolds you for slowing. Over the top, it coaches the descent.

On roads you have run before, and on your loops, the hill running coach calls the hill just before you reach it, so you can shorten the stride in time. Loops are found on their own from routes in Apple Health and your Gears runs, each with its height profile. Fit to a loop lays any run on a loop and suggests laps and direction so the hard work lands on flatter ground. A known loop travels to the watch, so its hills are called with no phone and no network.

The limits: on a road you have never run, the coach reacts to the climb as it happens instead of calling it ahead. Gears does not measure your form on a hill; its technique lines are cues, not detection. Your gears are personalized running zones, placed from your own running and refined by every run with heart rate, and heart rate can only ever make a gear easier.