Why Runners Need Strength Training

Most runners train by running more. But running alone creates strong endurance systems while leaving the musculoskeletal structures that support them vulnerable. Strength training fills this gap. Research consistently shows that adding 2-3 strength sessions per week improves running economy by 2-8%, increases maximal sprint speed, and builds the structural resilience that absorbs repetitive impact. A randomised study of 720 NYC Marathon runners published in the American Journal of Sports Medicine found that runners who consistently performed a targeted strength program (averaging 2 sessions per week) had significantly fewer minor injuries: 41.5% versus 56.2% in the control group. The evidence is clear: you do not need to become a bodybuilder, but you need to be stronger than running alone will make you. Two focused 20-30 minute sessions per week, targeting the muscles that running demands most, is the minimum effective dose that separates resilient runners from frequently injured ones.

The Exercises That Matter Most for Runners

Squats: the foundation movement. Barbell back squats, goblet squats, or bodyweight squats build the quadriceps, glutes, and hip stability that absorb impact during the stance phase of running. For runners, moderate depth (thighs parallel to the floor) at 3 sets of 8-12 reps is the sweet spot. You do not need to squat maximally heavy. The goal is building strength endurance: the ability to produce moderate force repeatedly over thousands of steps.

Single-leg Romanian deadlifts: hip stability and hamstring strength. Running is a single-leg activity. Each stride is essentially a single-leg hop. The single-leg RDL trains the hamstrings, glutes, and hip stabilisers in the same unilateral pattern. It also challenges balance and proprioception, both critical for stable foot placement on varied terrain. Perform 3 sets of 10 each side with a dumbbell or kettlebell.

Bulgarian split squats: unilateral quad and glute strength. The rear-foot-elevated split squat loads each leg independently, exposing and correcting strength asymmetries that bilateral squats can mask. It also trains the hip flexors of the trailing leg in a lengthened position, which benefits running hip extension. Three sets of 8-10 per leg with dumbbells is an effective dose.

Calf raises: the most undertrained muscle in runners. The calf-Achilles complex absorbs 6-8 times body weight with every running stride. Weak calves are a primary contributor to Achilles tendinopathy, calf strains, and plantar fasciitis. Single-leg calf raises, both straight-leg (gastrocnemius) and bent-knee (soleus), at 3 sets of 15 build the endurance capacity this muscle group needs. Progress to weighted calf raises as bodyweight becomes easy.

Planks and dead bugs: core endurance, not core power. Runners need core stability, not core movement. The core's role during running is to resist rotation and maintain pelvic alignment, not to produce force. Planks (front and side), dead bugs, and Pallof presses train this anti-rotation, anti-extension function. Aim for 30-60 second holds or 12-15 controlled reps. Crunches and sit-ups train the wrong pattern for running.

Glute bridges and hip thrusts: hip extension power. The glutes are the primary hip extensors that drive you forward during running. Weak glutes shift load to the hamstrings and lower back, both common injury sites. Glute bridges (bodyweight to start, barbell hip thrusts as you progress) at 3 sets of 12-15 build the hip extension capacity that keeps your stride powerful and your pelvis stable. Single-leg variations add a balance and asymmetry-correction component.

How to Structure a Runner's Strength Program

  • Frequency: 2 sessions per week, 20-30 minutes each. This is the evidence-based minimum effective dose. Two sessions allow adequate recovery between strength work and key running sessions. Schedule strength training on easy run days, ideally after the easy run or separated by several hours. Avoid strength work within 48 hours before a speed session, tempo run, or long run, as residual fatigue compromises running quality.
  • Load: moderate to heavy, lower reps. Runners benefit most from moderate to heavy loads at 6-12 reps per set. This rep range builds maximal strength and muscle endurance without significant hypertrophy (muscle size gain). High-rep, light-weight circuits (20+ reps) primarily train endurance, which running already develops. The goal of strength training is to fill the gap that running cannot: the ability to produce higher force per stride, which improves economy and reduces injury risk.
  • Exercise selection: compound movements with single-leg emphasis. Prioritise multi-joint exercises (squats, deadlifts, lunges, step-ups) over isolation exercises (leg extensions, hamstring curls). Compound movements train multiple muscle groups in functional patterns that transfer to running. Include at least one single-leg exercise per session to address the unilateral nature of running and correct asymmetries. A simple structure: one squat pattern, one hinge pattern, one single-leg exercise, one calf exercise, one core exercise.
  • Periodisation: match strength to your running phase. During base building and general preparation: higher volume strength work (3-4 sets, 8-12 reps) to build a structural foundation. During race-specific training: lower volume, higher intensity (2-3 sets, 4-6 reps) to maintain strength without accumulating fatigue. During taper and race week: reduce to 1 light session or eliminate entirely. Strength training should support your running, never compete with it for recovery resources.
  • Track foot mechanics alongside strength gains. As you build strength, your running mechanics often change. Stronger glutes improve hip stability, which changes how your foot lands and pushes off. Monitoring your gait with Arion Running Analysis can reveal whether strength improvements are translating to better symmetry, reduced pronation, and more efficient ground contact, confirming that your gym work is actually making you a better runner and not just a stronger person who runs.

FAQ

How often should runners do strength training?

Two sessions per week, each lasting 20-30 minutes, is the evidence-based minimum effective dose. Schedule strength work on easy run days, ideally after the run or separated by several hours. Avoid heavy strength training within 48 hours before speed sessions, tempo runs, or long runs. Some elite runners train strength 3 times per week during base phases, but for most recreational runners, twice weekly delivers the majority of the benefit without compromising running recovery.

What are the best strength exercises for runners?

The highest-value exercises for runners: squats (barbell or goblet, 3x8-12), single-leg Romanian deadlifts (3x10 each side), Bulgarian split squats (3x8-10 each side), single-leg calf raises (3x15 each side), glute bridges or hip thrusts (3x12-15), and core exercises like planks and dead bugs (30-60 second holds or 3x12-15). Prioritise compound, multi-joint movements over isolation exercises, and include at least one single-leg exercise per session to address running's unilateral demands.

Does strength training make you a faster runner?

Yes. Research shows that strength training improves running economy by 2-8%, meaning you use less energy at the same pace. It also increases maximal force production, which translates to a more powerful push-off and better hill-running ability. The improvements come from neuromuscular adaptations (better muscle fibre recruitment, improved tendon stiffness) rather than muscle size increases. Runners who add strength training typically see pace improvements within 8-12 weeks, particularly on hills and in the final kilometres of long races.

Will strength training prevent running injuries?

The evidence is promising but nuanced. A randomised study of 720 NYC Marathon runners found that higher compliance with a strength program was associated with significantly fewer minor injuries (41.5% vs. 56.2%). A 2024 systematic review and meta-analysis found that exercise-based prevention programs show benefit, though evidence is stronger for reducing injury severity than preventing all injuries. What is clear: muscle weakness, especially at the hips and core, is consistently found in injured runners. Strength training addresses this weakness directly. It may not eliminate all injuries, but it builds the structural resilience that makes injuries less frequent and less severe.

Should runners lift heavy or light weights?

Moderate to heavy loads at 6-12 reps per set are most beneficial for runners. This rep range builds maximal strength and neural adaptations without significant muscle hypertrophy. Light weights at high reps (20+) primarily train endurance, which running already develops. Heavy singles and doubles (1-3 reps) build maximal strength but require more recovery and carry higher injury risk for runners unfamiliar with lifting. The sweet spot for most runners: a weight that is challenging for the last 2-3 reps of each set, progressing gradually over weeks.

Sources

  1. PMC - A Randomized Study of a Strength Training Program to Prevent Injuries in Runners of the NYC Marathon (American Journal of Sports Medicine, 2020)
  2. PubMed - Do Exercise-Based Prevention Programs Reduce Injury in Endurance Runners? A Systematic Review and Meta-Analysis (2024)
  3. Strength Running - Lifting Weights for Runners: The Ultimate Guide (2024)