Strength Training for Half-Marathoners: 5 Key Moves to Prevent Injury

Introduction

Many runners consider strength training to be “a gym thing” that has nothing to do with running. However, research shows that regular runner-specific strength training can reduce injury risk by up to 50%, while also improving running form and running economy. For half-marathon runners in preparation, 20–30 minutes of strength training twice a week is one of the most cost-effective investments.

Common Injuries in Half-Marathon Runners

Understanding the causes of injuries allows you to choose preventive exercises with precision:

Injury Type	Main Cause	Related Weakness
Iliotibial Band Syndrome	Weak hip abductors	Gluteus medius, gluteus maximus
Plantar Fasciitis	Poor calf and plantar flexibility + weak core	Gastrocnemius, core
Runner’s Knee (Anterior Knee Pain)	Imbalance between quadriceps and glutes	Gluteus maximus, quadriceps
Tibial Stress Fracture	Excessive bone loading + insufficient muscle shock absorption	Posterior calf muscles

5 Key Strength Moves

Move 1: Single-Leg Glute Bridge

Target Muscles: Gluteus maximus, gluteus medius, hamstrings

How to Perform:

• Lie on your back with knees bent and feet flat on the floor
• Lift one leg and extend it, then drive through the other foot to push your hips up until your shoulders, hips, and knees form a straight line
• Hold at the top for 3 seconds, then lower slowly
• 3 × 12 reps per side

This move directly strengthens your “pushing power” and prevents IT band issues.

Move 2: Side-Lying Clamshell

Target Muscles: Gluteus medius

How to Perform:

• Lie on your side with knees bent at 45 degrees, keeping ankles together
• Slowly rotate the top knee upward (like a clamshell opening), making sure your pelvis doesn’t tilt backward
• Hold at the top for 2 seconds, then lower slowly
• 3 × 15 reps per side

You can add a resistance band for extra difficulty. A weak gluteus medius is one of the most common root causes of injury among runners.

Move 3: Bulgarian Split Squat

Target Muscles: Quadriceps, gluteus maximus, core

How to Perform:

• Place the top of your rear foot on a chair or step, with your front foot a big step forward
• Lower your body straight down, keeping the front knee from passing the toes and bringing the rear knee close to the ground
• Rise slowly while keeping your core engaged
• 3 × 10 reps per side; you can hold dumbbells to increase difficulty

This is the most practical single-leg strength move for runners, directly mimicking the single-leg support phase of running.

Move 4: Calf Raise

Target Muscles: Gastrocnemius, soleus

How to Perform:

• Stand on the edge of a step with your heels hanging off
• Slowly raise your heels to the highest point and hold for 2 seconds
• Lower slowly until your heels drop below the step edge (full stretch)
• 3 × 15–20 reps; advanced runners can perform them on one leg

Strong calf muscles absorb the impact of every stride and are key to preventing plantar fasciitis.

Move 5: Plank + Side Plank

Target Muscles: Core, transversus abdominis, gluteus medius

How to Perform:

• Hold a standard plank for 30–45 seconds, keeping your body in a straight line
• Then transition to a side plank, holding for 20–30 seconds on each side
• 3 sets

A strong core maintains running form, reduces energy waste, and protects the lumbar spine.

Training Schedule Recommendations

• Frequency: Twice a week, ideally after an easy run or on a recovery day
• Duration: 20–25 minutes per session (5 moves × 3 sets)
• Avoid: Do not perform strength training on long-run days or interval days to prevent fatigue from stacking up

Practical Tips

• Start with bodyweight movements and only add load once your form is correct
• Progress every 4 weeks: increase weight, shorten rest periods, or switch to unilateral variations
• If you have existing injuries, have a physical therapist assess you first and choose appropriate exercises

Conclusion

Strength training is not a supporting act—it is an indispensable part of a half-marathon training plan. An investment of 25 minutes twice a week will keep you healthy through high-mileage training and help you complete 21 kilometers with more efficient form. A strong body runs farther and lasts longer.

Related Reading

• Strength Training for Runners: Six Key Moves to Prevent Injury
• Strength Training for Half-Marathon Runners: Twice-Weekly Lower-Body and Core Reinforcement
• Running Injury Prevention: The 5 Most Common Running Injuries and How to Prevent Them
• Injury Prevention Training for Endurance Athletes: Ten Key Moves to Protect Your Athletic Career