Every beginner trail runner has the same humbling moment: a hill that looked gentle from below turns into a wall of burning legs and ragged breathing. The good news is that uphill running is a skill, not just a fitness test, and small technique changes make climbs feel dramatically easier within a few weeks.

The first rule is to shorten your stride. On flat ground a long stride feels efficient, but uphill it wastes energy and strains your calves. Take quick, short steps, land under your body rather than ahead of it, and lean slightly forward from the ankles, not by hunching at the waist. Keep your arms driving: bent elbows, hands relaxed, arms swinging front to back rather than across your body.

The second rule is to run by effort, not pace. Your pace will slow on climbs no matter how fit you are, so chasing a flat-ground pace uphill only leads to blowing up halfway. Aim for a steady, sustainable effort where you can still speak in short phrases, and accept that walking steep sections is smart racing, not failure. Even experienced trail runners power-hike the steepest pitches.

Power hiking deserves its own practice. On very steep ground, lean forward, place your hands on your thighs just above your knees, and push down as you step up. This uses your arms to assist your legs and is far more efficient than staggering uphill with your hands flailing. Practise the transition: run the runnable gradient, hike the steep pitch, and run again as soon as the slope eases.

Train hills gradually, once a week at first. Start with a route that includes three to five short climbs, or repeat a single gentle hill four to six times with an easy jog back down. Build the number of repeats slowly over a month. Downhill running is part of the same session: stay relaxed, shorten your stride, and let gravity help rather than braking hard with every step, which is what leaves beginners with sore quads.

Footwear and fuel matter more on hilly trails than on flat paths. Trail shoes with good grip prevent slipping on loose climbs, and carrying water on routes longer than about an hour stops the dehydration that makes hills feel twice as hard. Eat a small snack before a hilly run, and do not start a long climb on an empty stomach.

Within a few weeks of weekly hill practice, you will notice climbs that once stopped you becoming runnable, and your flat running will feel easier too. Hills build leg strength and cardiovascular fitness faster than almost any other single workout, which is why trail runners learn to love them, eventually, and why the view from the top always feels earned.

A beginner hill plan builds gradually over six weeks. In week one, include two or three short climbs in a normal easy run, walking the steepest parts without guilt. In weeks two and three, add one weekly hill-repeat session: jog up a gentle slope for one to two minutes, jog easily back down, and repeat four to six times. In weeks four to six, extend the repeats to eight, or choose a longer route with several climbs, and practise power hiking on the steepest sections. Keep one hill session per week and your other runs easy, because hills are intense training disguised as a normal run.

Downhill technique deserves equal attention, because most trail running soreness and many falls happen on descents. Lean slightly forward, keep your steps quick and short, land under your body, and relax your upper body instead of stiffening up. Look a few metres ahead rather than straight down at your feet, so you can pick your line through rocks and roots. Practise descents on gentle slopes first, and save technical downhills for when your legs are fresh, not at the end of a long run when fatigue makes every misstep more likely.