Trail runners often treat strength training as optional, something to do when there is time left over after running. In reality, it is one of the most effective ways to run faster, stay injury-free, and handle technical terrain with confidence. Two short sessions a week, focused on the right movements, can transform how you feel on the trails.

Trail running is essentially a series of single-leg landings, so single-leg strength matters more than two-legged strength. Split squats, step-ups, and single-leg deadlifts build the balance and power that each stride demands. These exercises also expose and correct imbalances between your left and right legs, which are common and often invisible until they cause an injury.

Start with bodyweight and add load gradually, using dumbbells or a weighted backpack. Two to three sets of six to ten reps per leg is a good target, with a focus on slow, controlled lowering. The goal is strength you can use on the trail, not maximum weight in the gym, so form and control always come before load.

Calves do an enormous amount of work on trails, absorbing impact on descents and pushing off on climbs. Single-leg calf raises, done with both a straight and a bent knee, strengthen the calf and the Achilles tendon together. Add balance work such as standing on one leg on an uneven surface, which trains the small stabiliser muscles that prevent ankle sprains.

The core connects your upper and lower body and keeps you stable on uneven ground. Planks, side planks, dead bugs and Pallof presses are all excellent choices. A strong core also protects your lower back on long runs when fatigue sets in. Ten minutes of core work at the end of a strength session is enough to make a real difference.

The best time for strength training is on a day when you are not doing a hard run, or after an easy run. Two sessions of 30 to 40 minutes per week is enough for most runners. Keep the sessions simple and consistent rather than elaborate and irregular, because consistency is what builds strength over months.

During heavy training weeks or before a race, reduce the strength load rather than skipping it entirely. Lighter weights and fewer sets keep the habit alive without adding fatigue. Strength training is not separate from your running, it is part of it, and the runners who treat it that way are the ones still running strongly years later.

One exercise that deserves special mention is the step-down, which directly trains the downhill braking that trail running demands. Stand on a low box or step, lower one foot slowly to the ground, tap it lightly, and return, keeping your knee tracking over your toes throughout. Three sets of eight per leg, done slowly, builds the eccentric quadriceps strength that protects your knees on descents. Another useful move is the farmer's walk, carrying something heavy in each hand while walking, which builds grip, core and posture all at once. These simple, functional movements carry over to the trail far better than machine exercises, because they train the body to work as a connected system rather than as isolated parts.

Trail runners need single-leg strength, strong calves and ankles, and a solid core. Two short sessions a week with split squats, calf raises and core work will make you faster, more stable, and far less likely to get injured on the trails. Start this week with just one short session, keep it simple, and let the habit grow from there, because the runners who stay strong are the ones who start small and never stop.