All methods improve running economy
Heavy strength training, plyometrics, HIIT, and bodyweight training all provide 2 to 8% gains in running economy. The choice depends on your goals, your level, and your access to equipment.
Adding strength training is a performance catalyst for runners. Scientific studies confirm it: whether you use heavy loads, plyometrics, HIIT, or bodyweight exercises, all these methods can improve your running economy by 2 to 8%.
So which method should you choose? The answer depends on three factors: your goals (pure performance vs. prevention), your level (beginner vs. advanced), and your access to equipment. This article scientifically compares these four approaches to help you make the best choice.
1. Traditional resistance training (heavy loads)
Mechanisms and benefits: maximal strength
This method relies on classic heavy-load exercises: squats, deadlifts, leg press, generally at 70-90% of your 1RM (one-repetition maximum). The goal is to develop your muscles' maximal strength.
The key benefit: running economy
Meta-analyses show that high-load strength training (close to 90% of 1RM) produces running economy gains of ~5-6%, meaning a lower O₂ cost at the same speed.
📚 Beattie et al. (2017): 40 weeks of heavy strength training in competitive runners → significant improvements in economy, velocity at VO₂max, and strength (1RM squat), with no change in body weight.
💡 Why does it work?
Stronger muscles mean that, at a given running speed, you use a smaller percentage of your maximal strength. Your stride becomes more economical, and you can hold the pace longer.
Limitations and application
✗ Requires equipment and technique
Access to a weight room is essential. Proper technique is required to avoid injury (learning to squat correctly takes time).
✗ Time and consistency
Requires at least 8 to 12 weeks of consistent training (2-3 sessions/week) for robust gains. Highly trained runners need 12+ weeks.
✗ Significant residual fatigue
30-60 minute sessions are very demanding on the nervous system. Risk of interference with running training if poorly planned.
✗ Less specific at high speed
Mainly improves economy at moderate paces (12-14 km/h). Less effect at fast race speeds (16+ km/h).
📋 Sample program
- • Frequency: 2-3 sessions/week
- • Load: 70-90% of 1RM
- • Exercises: squats, deadlifts, leg press, lunges, step-ups
- • Volume: 2-4 sets of 4-8 reps
- • Duration: base phase (off-season), 8-12 weeks minimum
2. Plyometric and explosive training (jumps, bounds)
Mechanisms and benefits: spring elasticity
Plyometrics includes jumping, hopping, and bounding exercises. Its role: train the stretch-shortening cycle (SSC), where the tendon stores and then returns elastic energy with every stride.
The key benefit: tendon stiffness and reactive strength
Achilles tendon stiffness improvement
+16%
In 14 weeks
Oxygen cost reduction
-4%
At steady pace
Plyometrics improves running economy by 4-8% after only 6-9 weeks. Faster than heavy strength training.
🎯 Speed specificity: Plyometrics improves economy at high speed (16 km/h, or ~3:45/km), which pure heavy training does not do as directly.
1. Reactive strength (RFD)
Rate of Force Development is the speed at which you generate force. In running, you have 100-200 ms to produce a push-off. Plyometrics specifically trains this explosive capacity.
2. Time specificity
Jumps reproduce the ground contact times of running (100-200 ms). This specificity makes the adaptations directly transferable to your stride.
3. Accessible and efficient
No equipment required. You can do plyometrics anywhere: at home, in a park, while traveling. Short sessions (20-30 min), ideal for busy runners.
Limitations and application
✗ High intensity
Requires a prior strength base to avoid injuries. Not recommended for complete beginners without preparation.
✗ Suboptimal technique in beginners
Unconditioned runners often have ground contact times that are too long, reducing plyometric effectiveness until technique improves.
3. Bodyweight-only training
Mechanisms and benefits: accessibility and prevention
Bodyweight exercises (lunges, squats, planks, glute bridges) are the most accessible. No equipment, doable anywhere, and excellent for strengthening core and hip stability.
Key advantage: injury prevention
A routine targeting the hip and core (glutes, abductors, stabilizers) reduced injury risk by 39%in recreational runners.
💡 These exercises correct muscular imbalances, the main cause of injuries (IT band syndrome, tendinopathies, shin splints).
✓ Maximum accessibility
No equipment required. Perfect for runners who travel, have a limited budget, or prefer training at home.
✓ Improved core/hip stability
Strengthens stabilizing muscles (glutes, obliques, transverse abdominis) that are essential for an efficient, injury-free stride.
✓ Low residual fatigue
15-25 minute sessions, minimal neuromuscular fatigue. Easy to integrate even during competition periods.
Limitations and application
✗ More modest economy gains
Running economy improvement is generally lower than with plyometrics or heavy strength training.
✗ Plateau risk
In well-trained athletes, external load is insufficient to maximize strength or power. Progress becomes limited after a few months.
4. HIIT training and hybrid approaches (e.g. Renforun)
Mechanisms and benefits: efficiency and synergy
Hybrid methods combine muscular strengthening and intense cardiovascular work in short, intense circuits (CrossFit style, sprints, muscular HIIT). Think: burpees, jump squats, sprints, kettlebell swings... all chained together.
The main advantage: time efficiency
Session duration
10-25 min
5K gains
≈ Polarized
Comparable
Combined benefits
VO₂max + Economy
Studies show that hybrid programs can improve 5K running times in a comparable way to traditional polarized endurance programs, while also providing muscular strength benefits.
🔬 The synergy: Replacing part of easy mileage with explosive/HIIT sessions can produce better performance gains than increasing volume alone, especially in already well-trained runners.
✓ Maximum time savings
10-25 minutes is enough for a complete session. Ideal for runners with major professional or family constraints.
✓ Double stimulus
Simultaneously improves VO₂max (maximal aerobic capacity) and running economy (neuromuscular efficiency). Two qualities in one session.
✓ Intelligent volume substitution
Replacing 1-2 easy endurance sessions with hybrid HIIT = better performance gainsthan simply adding kilometers, especially for advanced runners who have reached a plateau.
Limitations and application
✗ High fatigue
Generates significant peripheral and central fatigue. Requires strict recovery management to avoid interfering with key runs.
✗ Risk of being too general
There is a risk of not optimizing one specific quality if training is too general ("Jack of all trades, master of none").
Summary: choosing the right approach
How the methods complement each other
The optimal approach is often hybrid or periodized. The methods are not mutually exclusive; they can be combined strategically depending on the phase of the season.
📅 Example annual periodization
Heavy strength training (70-90% 1RM) to develop raw strength and correct weaknesses. 2-3 sessions/week, 8-12 weeks.
Plyometrics + hybrid HIIT to convert strength into speed and explosive power. 2 sessions/week, 6-9 weeks.
Bodyweight + light plyometrics to maintain gains without residual fatigue. 1-2 short sessions/week.
Heavy strength training and plyometrics are the most effective for the specific neuromuscular adaptations that directly improve running economy.
When the hybrid/Renforun approach is superior
Despite the potentially higher gains from heavy strength training or pure plyometrics, there are scenarios where hybrid approaches are preferable:
Time or equipment constraints
Convenience and consistency outweigh the potential absolute gains of a missed gym program. If you do not have gym access or only have 15-20 minutes, a well-structured hybrid HIIT session (e.g. Renforun) is more effective than doing nothing or missing your strength sessions.
Competition period (tapering)
Bodyweight strengthening and light plyometrics maintain neuromuscular gains with less residual fatigue than a heavy-load session. Ten days before an important race, a 15-minute session of light jumps and core work is smarter than squatting at 85% of 1RM.
Injury prevention
For runners who are cautious with heavy loads (injury history, technique not mastered), bodyweight hip/core routines are safer and significantly reduce injury risk (-39% in some studies). Safety comes before maximal performance.
Comparison table of methods
| Method | Economy gain | Minimum duration | Equipment | Best for |
|---|---|---|---|---|
| Heavy loads | 5-6% | 8-12 weeks | Gym required | Maximal strength, advanced runners |
| Plyometrics | 4-8% | 6-9 weeks | None | High speed, reactive strength |
| Bodyweight | 2-4% | 4-8 weeks | None | Prevention, beginners |
| Hybrid HIIT | 3-6% | 6-10 weeks | Minimal | Time savings, efficiency |
Conclusion: strength training, the forgotten efficiency factor
All science-based methods contribute to performance. Whether you choose heavy strength training, plyometrics, bodyweight work, or a hybrid approach, you will improve your running economy, resilience, and longevity as a runner.
The key is not to find the "perfect" method, but to find the one you will actually do consistently. A 15-minute hybrid program done twice a week will always beat an "optimal" heavy strength program that you never do because you lack time.
🎯 Final recommendation
Find the right balance between stimuli for your profile:
- • Beginners/intermediates: Bodyweight + light plyometrics (prevention + fundamentals)
- • Advanced runners with time: Heavy strength in base phase + plyometrics in build phase (maximal gains)
- • Busy/no equipment: Hybrid HIIT (Renforun) 2-3x/week (efficiency)
- • In competition: Bodyweight + light plyometrics (maintenance without fatigue)
The best program is the one you will follow. Choose, start, and stay consistent.
Simple RenfoRun-style version
After the comparison, give one simple choice readers can apply without overthinking.
- If you want simple: 2 RenfoRun sessions per week.
- Session 1 — strength: AMRAP (as many rounds as possible) for 8 min with lunges, good mornings, core work.
- Session 2 — plyometrics/HIIT: Tabata (20 sec effort / 10 sec rest) with hops, high knees, mountain climbers.
You understand the method. RenfoRun gives you the workout.
No planning, no hesitation — just open the app and follow the session.
- ✓ Guided workouts with timer — just follow along
- ✓ Automatic progressions: your sessions evolve every week
- ✓ 12 to 25-minute sessions, designed to fit your running schedule
- ✓ Built exclusively for runners — road or trail