Strength and Conditioning: Building a Resilient Runner

When you're preparing for a mountain ultra or a long fell race, you're asking your body to run for many hours over uneven, hilly, and often unpredictable terrain. Strength and conditioning isn't an optional extra — it's one of the highest-leverage things you can do to run faster, last longer, and stay injury-free.

This doesn't mean becoming a gym junkie or lifting for aesthetics. It means building functional strength, stability, and resilience that directly support what you do on the fells.

Why Strength Training Matters for Trail and Ultra Runners

Every stride you take on the trails is essentially a single-leg hop — repeated thousands of times. Over a long ultra, small weaknesses become major problems. Your form collapses, your hips drop, your ankles roll more, your knees start to complain. Good strength work prevents all of this.

Here's what a consistent S&C routine actually delivers:

• Improved posture and efficiency under fatigue. As you tire, form naturally starts to collapse. A strong posterior chain — glutes, hamstrings, and core — keeps you upright and efficient, especially on climbs and in the final miles of a long race.
• Reduced injury risk. Strength work corrects muscle imbalances that lead to knee pain, Achilles issues, and IT band problems. Strong stabilising muscles absorb shock and reduce the load on your joints over thousands of repetitions.
• More power and control on climbs and descents. Mountain races have sustained climbs and steep technical descents. Leg strength and eccentric control — the ability to absorb force going downhill — stop your quads from blowing up mid-race.
• Better running economy. Research shows runners who lift twice a week improve their efficiency — meaning you hold pace with less effort. Over a 12-hour race, that compounds significantly.

Think of S&C as your long-term injury insurance policy. The athletes who stay healthy and train consistently across years are almost always the ones who've made strength work a non-negotiable habit.

Key Areas to Focus On

You don't need a fully equipped gym. Bodyweight, a set of dumbbells, a resistance band, and a step or bench will cover almost everything a trail runner needs.

Lower Body

Squats and Lunges. These build strength in the quads, glutes, and hamstrings — the muscles that power climbs and absorb impact on descents. Variations include bodyweight squats, goblet squats, reverse lunges, and walking lunges. Focus on full range of motion and control rather than load or speed. Two to three sets of 8–12 reps, one to two times per week, is plenty for most trail runners.

Step-Ups. Fantastic for single-leg control and directly mimics uphill movement. Use a bench or box at roughly knee height. Step up with control, drive through your heel, and lower slowly. Add a backpack or dumbbells as you progress. The slower you lower, the harder your muscles work — that eccentric phase is exactly what protects you on descents.

Single-Leg Deadlifts. One of the best exercises for balance, coordination, and hamstring strength. Keep your hips square and your back flat — think "reach long behind you" rather than "drop your torso low." This stabilises the hips and improves your balance on technical terrain. If it feels wobbly at first, that's the point — stick with it.

Calf Raises. Calves absorb impact on every landing and power the push-off on every stride. Do both seated calf raises (which targets the soleus, deeper calf) and standing (gastrocnemius). Progress to single-leg raises for real strength and endurance. Many ultra runners neglect calves entirely and then cramp hard in the later stages of a race. Consistent calf work prevents that.

Core and Stability

A strong core connects your upper and lower body movement efficiently. On technical terrain, your core is working constantly to keep you stable — it's not about six-packs, it's about control.

Planks and Side Planks. Develop deep core endurance and protect your spine. Hold for 20–60 seconds, focusing on bracing and breathing — not arching your lower back or letting your hips sag. If you can hold a plank for 60 seconds without compensation, increase the difficulty (add movement, try a single-leg plank) rather than just timing it longer.

Bird Dogs and Dead Bugs. These train coordination and spine stability while limbs are moving — exactly what happens on a rocky trail when your feet go one way and your upper body tries to maintain balance. Simple exercises, but highly effective when done with control and focus.

Pallof Press / Band Rotations. Attach a resistance band to a fixed point, hold it at chest height, and press straight out — resisting the rotation. This trains the core to resist twisting forces, which is critical when you're running on cambered or rocky ground. It's an underrated exercise that pays off quickly in felt running stability.

Mobility and Ankle Stability

Mobility keeps joints moving freely and reduces strain on surrounding muscles. If you work a desk job or spend long hours sitting, mobility work directly counteracts the tightening that accumulates through the week.

The key areas for trail runners are the hips (tight hip flexors limit stride length and cause back pain), ankles (stiff ankles reduce shock absorption and increase the risk of rolling), and the thoracic spine (good rotation and posture improves your breathing mechanics on climbs). Use dynamic stretches before runs — leg swings, hip circles, ankle rotations — and static stretching or foam rolling after training to restore range of motion.

The goal isn't yoga-level flexibility. It's smooth, functional movement that lets you run naturally and efficiently over whatever the terrain throws at you.

How to Fit S&C Into Your Week

Time is always a factor, especially for runners balancing training with work and family. The good news is that you don't need long sessions — you need consistent ones.

Off-season and base phase: Two focused sessions per week of 30–45 minutes. This is when you build the foundation. Use this phase to develop genuine strength in the key exercises before the load of race-specific training increases.

Race build-up: Reduce to one maintenance session per week of 20–30 minutes. You've built the strength — now you're maintaining it without accumulating fatigue that compromises your running sessions.

Race week: No strength work. Focus on rest and sharpness.

Practically, pair S&C sessions with easy run days — a short recovery run followed by 20 minutes of core and stability work is a natural pairing. Avoid heavy strength work the day before a long run or an interval session. Even 10–15 minute micro-sessions add up meaningfully if done consistently. Think long-term consistency, not perfection.

Making S&C Race-Specific

As you move closer to race day, shift your focus from general strength to movements that replicate what the race actually demands.

• Hill sprints and stair climbs — develop both strength and cardiovascular power. Short, steep efforts uphill are excellent training and transfer directly to race-day climbing ability.
• Weighted pack hikes — mimic race-day fatigue and strengthen the postural muscles that keep your upper body stable under load. Use your race vest loaded with your kit.
• Eccentric control drills — slowly lower from step-ups or lunges to specifically train the muscles responsible for controlling descent. Three seconds down, explosive up. Your quad tendons and knees will thank you.

These activities bridge the gap between gym strength and real-world performance on mountain terrain. They're also the exercises most runners skip — which is why the people who do them consistently hold their form so much better in the back half of hard races.

Recovery: Where the Adaptation Actually Happens

Strength training creates the stimulus for adaptation — but adaptation happens during recovery. Without adequate rest and nutrition, the hard sessions become net negatives rather than gains.

• Sleep — most muscular and hormonal adaptation happens overnight. Seven to nine hours is the target. If you're consistently under this, consider sleep quality before adding more training volume.
• Protein — aim for roughly 20–30g per meal across the day for most active adults. Spreading intake through the day is more effective than trying to hit a large total in one sitting.
• Active recovery — light mobility work, yoga, walking, or easy cycling on recovery days keeps muscles loose and accelerates recovery between sessions.
• DOMS (Delayed Onset Muscle Soreness) — normal at the start of a new S&C routine, especially with eccentric work. If soreness is significantly affecting your ability to run well, ease back and rebuild more gradually. The adaptation will come.

The coaching principle that holds through every phase of training: train hard enough to grow stronger, but easy enough to train again tomorrow.

Where to Start if You Haven't Done S&C Before

Start simple. Three exercises, twice a week, done with control and consistency. Squats, single-leg deadlifts, and planks cover the majority of what most trail runners need. Add calf raises and step-ups once those feel solid. Progress load gradually, prioritise form over weight, and give it eight weeks before judging the results.

If you want a structured strength programme built around your running schedule and race goals, that's exactly what our coaching includes. Get in touch and we'll put something together for you.