October 8, 2025

Ultimate 3-Day Strength Training Split for Runners -12-Week strength training Plan

It was a busy afternoon at the gym in the heart of London when I first met Ola. He walked in, weighing 115kg, with determination in his eyes but uncertainty about where to start. He had a fire burning inside him and a goal that seemed both daunting and inspiring: to transform his life and lose 25kg. As a personal trainer with over a decade of experience coaching men and women to unlock their inner strength, I knew that Ola’s journey would require more than just one approach. We combined strength training, HIIT, and boxing to create a comprehensive program that would strip away the excess weight while building lean muscle and cardiovascular fitness.

After months of dedication and hard work, Ola achieved his initial goal of losing 25kg. But I knew that maintaining motivation after reaching such a significant milestone could be challenging. That’s when we set a new goal that would keep him driven and focused: running a half-marathon. We needed something that would challenge him in a completely different way and maintain the momentum. The transition from weight loss to endurance running required a strategic shift in our training approach, but the foundation of strength we had built became the secret weapon that would take his performance to the next level.

Many runners believe that the only way to become a better runner is to run more. While running is, of course, essential, strength training is the secret weapon that can take your performance to the next level. It’s the difference between finishing a race and crushing it. It’s the key to preventing injuries, improving your running economy, and unlocking a new level of power and speed you never thought possible. Just take it from Ola, who not only conquered the Hackney Half but also the London Half Marathon, achieving an incredible time of 1:50. His journey is a testament to the transformative power of combining strength training with running, a journey you can embark on too.

This article will guide you through a 12-week strength training program designed specifically for runners. We’ll delve into the importance of strength training, debunk common myths, and provide you with a detailed, easy-to-follow plan that you can perform at the gym. This program is designed to be used with the 12Reps app, a powerful workout tracker app that will help you stay on track and monitor your progress. Whether you’re a seasoned marathoner or just starting your running journey, this program will help you build the strength, power, and resilience you need to achieve your goals.

12Reps App | Best Strength Training App 2025 to Build Muscle, Track Workouts & Train Anywhere

The “Why” Behind Strength Training for Runners

Before we dive into the program, let’s talk about why strength training is so crucial for runners. Think of your body as a high-performance vehicle. Your cardiovascular system is the engine, but your muscles, bones, and connective tissues are the chassis, suspension, and tires. If you have a powerful engine but a weak chassis, you’re not going to be able to handle the demands of the road. You’re more likely to break down and get injured.

Strength training helps to:

  • Prevent Injuries: Running is a high-impact activity that places significant stress on your joints and muscles. Strength training helps to strengthen your muscles, ligaments, and tendons, making them more resilient to the repetitive stress of running. This can significantly reduce your risk of common running injuries like runner’s knee, shin splints, and IT band syndrome.
  • Improve Running Economy: Running economy refers to the efficiency with which your body utilises oxygen at a given pace. The better your running economy, the less energy you expend to run at a certain speed. Strength training, particularly exercises that target the legs and core, can enhance your running economy by increasing muscle power and stiffness, enabling you to generate more force with each stride.
  • Increase Power and Speed: Stronger muscles can generate more force, resulting in a more powerful and explosive running stride. This can help you run faster and more efficiently, especially when it comes to hills and finishing sprints.
  • Enhance Muscular Endurance: Strength training helps your muscles become more resistant to fatigue, allowing you to maintain your form and pace for longer periods.
12-Week Strength Training for Runners: The Ultimate Guide to Building Power and Endurance

The 12-Week Strength Training Program for Runners

This 12-week program is divided into three phases, each lasting four weeks. The program follows a push/pull/legs and core split, with three workouts per week. This structure enables adequate recovery between workouts and ensures that all major muscle groups are effectively targeted.

Equipment Needed:

Warm-up (10 minutes):

  • Incline walk on a treadmill or rowing for 10 minutes.
  • Mobility stretches (see table below).

Stretch

Description

Cat-Cow

Start on your hands and knees. Inhale as you drop your belly towards the mat and look up. Exhale as you round your spine and tuck your chin to your chest.

World’s Greatest Stretch

Step forward into a lunge. Place your hand on the inside of your front foot and twist your torso towards your front leg, reaching your other arm towards the ceiling.

Hamstring Stretch

Sit on the floor with one leg extended straight out in front of you and the other leg bent with the sole of your foot against your inner thigh. Gently lean forward over your straight leg.

Cool-down (10 minutes):

  • 10 minutes on the StairMaster or incline walk on the treadmill.

Finisher (4 sets):

  • 30 Squats/Knee Press
  • 30 Sit-ups
  • 30 Calf Raises
  • 30 Glute Bridges

Perform this finisher every morning before showering or every evening before going to bed.

12-Week Strength Training for Runners: The Ultimate Guide to Building Power and Endurance

Phase 1: Foundation Building (Weeks 1-4)

This phase focuses on building a solid foundation of strength and stability. We will use higher reps and lower weights to focus on proper form and technique. Each workout consists of 6 exercises, with 4-5 sets of 10-12 reps.

Workout A: Push

Exercise

Sets

Reps

Weight

Rest Period

Dumbbell Bench Press

4-5

10-12

Light

60 seconds

Incline Dumbbell Press

4-5

10-12

Light

60 seconds

TRX Push-ups

4-5

As many as possible

Bodyweight

60 seconds

Dumbbell Shoulder Press

4-5

10-12

Light

60 seconds

Lateral Raises

4-5

10-12

Light

60 seconds

Tricep Pushdowns (Resistance Band)

4-5

10-12

Light

60 seconds

Workout B: Pull

Exercise

Sets

Reps

Weight

Rest Period

Pull-ups (or Lat Pulldowns)

4-5

As many as possible

Bodyweight

60 seconds

Bent-over Dumbbell Rows

4-5

10-12

Light

60 seconds

TRX Rows

4-5

10-12

Bodyweight

60 seconds

Face Pulls (Resistance Band)

4-5

10-12

Light

60 seconds

Dumbbell Bicep Curls

4-5

10-12

Light

60 seconds

Hammer Curls

4-5

10-12

Light

60 seconds

Workout C: Legs & Core

Exercise

Sets

Reps

Weight

Rest Period

Goblet Squats (Kettlebell)

4-5

10-12

Light

60 seconds

Dumbbell Lunges

4-5

10-12 per leg

Light

60 seconds

Romanian Deadlifts (Dumbbell)

4-5

10-12

Light

60 seconds

Glute Bridges (Loop Band)

4-5

15-20

Bodyweight

60 seconds

Plank

4-5

30-60 seconds

Bodyweight

60 seconds

Leg Raises

4-5

15-20

Bodyweight

60 seconds

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Phase 2: Strength & Power (Weeks 5-8)

In this phase, we will increase the intensity by introducing supersets and heavier weights. A superset is when you perform two exercises back-to-back with no rest in between. Each workout consists of 5 exercises and 4 supersets, totalling 9 exercises. We will perform 4 sets of 8-10 reps.

Workout A: Push

Exercise

Sets

Reps

Weight

Rest Period

Superset 1

4

  

90 seconds

Barbell Bench Press

 

8-10

Moderate

 

Dumbbell Flyes

 

10-12

Light

 

Superset 2

4

  

90 seconds

Overhead Press (Barbell)

 

8-10

Moderate

 

Arnold Press (Dumbbell)

 

10-12

Light

 

Single Set

4

   

Dips (or Bench Dips)

 

As many as possible

Bodyweight

60 seconds

Workout B: Pull

Exercise

Sets

Reps

Weight

Rest Period

Superset 1

4

  

90 seconds

Weighted Pull-ups (or Lat Pulldowns)

 

8-10

Moderate

 

T-Bar Rows

 

8-10

Moderate

 

Superset 2

4

  

90 seconds

Seated Cable Rows

 

10-12

Light

 

Reverse Pec-Deck

 

10-12

Light

 

Single Set

4

   

Barbell Bicep Curls

 

8-10

Moderate

60 seconds

Workout C: Legs & Core

Exercise

Sets

Reps

Weight

Rest Period

Superset 1

4

  

90 seconds

Barbell Squats

 

8-10

Moderate

 

Leg Press

 

10-12

Moderate

 

Superset 2

4

  

90 seconds

Deadlifts

 

5-8

Heavy

 

Hamstring Curls

 

10-12

Light

 

Single Set

4

   

Calf Raises

 

15-20

Moderate

60 seconds

The Ultimate 3-Day Strength Training Split for a Petite Powerhouse

Track Your Progress with the 12Reps App

To get the most out of this program, it’s essential to track your progress. This is where the 12Reps app comes in. The 12Reps app is a comprehensive strength training app and workout tracker that allows you to:

  • Build Your Routine: You can easily build the workouts from this program in the app by navigating to the ‘Build Your Routine’ section and selecting the exercises.
  • Track Your Sets, Reps, and Weight: The app enables you to log your sets, reps, and weight for each exercise, allowing you to track your progress over time.
  • Use the Stopwatch: The app has a built-in stopwatch to help you monitor your rest periods and stay on track.
  • Access a Library of Exercises: The app features a vast library of exercises with video demonstrations, ensuring you perform each exercise with proper form.

Ready to take your running to the next level? Download the 12Reps app today and start your 7-day free trial. It’s time to build a stronger, faster, and more resilient you.

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About the Author

Will Duru is a certified personal trainer with over 10 years of experience in the fitness industry. He specialises in helping men and women build strength, lose weight, and improve their athletic performance. Will is passionate about empowering his clients to achieve their goals and live healthier, more fulfilling lives.

References

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12Reps Team

The 12reps app is your ultimate fitness companion, crafting tailored workout plans, tracking your progress, and keeping you motivated every step of the way. Whether you’re at home, in the gym, or on the go, our adaptable approach fits seamlessly into your lifestyle — providing the support and guidance you need to crush your goals and stay on track.
12-Week Strength Training for Runners: The Ultimate Guide to Building Power and Endurance

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