Why Smart Strength Training Supercharges Endurance (and How to Fit It In)

Marilena Kokkinou and Konstantinos Palikaris | 09/11/2025 | Tips

Why strength is crucial to endurance sports

For decades, endurance athletes believed that “more training on their sport” was the only way to improve. But research over the past 20 years shows that adding structured strength training provides benefits that endurance work alone cannot achieve:

Improved Running Economy & Efficiency
Heavy strength and plyometric training enhance neuromuscular coordination and muscle–tendon stiffness, lowering the oxygen cost of running and cycling at submaximal speeds. This means you use less energy at the same pace.

Greater Fatigue Resistance
Strength work recruits fast-twitch fibers that are usually under-utilized in endurance training. Over time, these fibers become more resistant to fatigue, helping you sustain your target pace deeper into long events.

Higher Sustainable Power
By increasing maximal strength, athletes also improve their ability to produce force at a lower relative intensity, translating into more stable outputs (pace, watts, strokes) for the same perceived effort.

Injury Prevention & Tissue Resilience
Strength training builds tendon stiffness, bone density, and muscular balance, reducing the risk of overuse injuries common in runners, cyclists, and triathletes.

Long-Term Performance Durability
Studies show that even when endurance training volume is slightly reduced to accommodate strength sessions, overall performance improves. In the long run, strength is “endurance insurance.”

Now that we know why strength matters, the real question is: how do we fit it in?

If you coach or train for endurance, you already know the paradox: time is limited, legs aren’t. Long runs, quality rides, swim sets—plus work, family, sleep. Where does strength training fit?

Short answer: front and center. A small, strategic dose of strength work reliably improves what matters most in endurance—efficiency, fatigue resistance, sustainable power—without compromising your engine. And yes—you can make it happen even in a packed week. Here’s how:

How to Weave Strength into a Demanding week – 4 tips to keep in mind

1) Keep the Dose Small, the Intent High

Frequency: 2x/week during base/build phases; 1x/week in-season maintenance.
Duration: 30-60 minutes. Aim for 3–6 hard leg sets plus 2–4 accessory and core sets per session.
Effort: Aim for RPE 7–9 or 1–3 reps in reserve on main lifts; stop before form breaks down.

2) Minimize “Interference”

Space sessions by 6–8 hours when possible (e.g., AM run / PM lifts).
Prioritize by goal: If running quality is the focus, run first; if strength is the goal, lift first.
Cluster stress, protect recovery: Place heavy lifting on hard endurance days so rest days stay restful.

3) Pick from the Essentials

Back Squat / Front Squat → Quad-dominant, full-body strength, core stability
Traditional Deadlift / Trap-bar Deadlift → Global posterior chain, hip + back power
Romanian Deadlift (RDL) → Glutes and hamstrings, posterior chain emphasis
Hip Thrust → Maximal glute strength, powerful hip extension for running & cycling
Lunges (Forward / Reverse) → Dynamic single-leg strength, balance, hip mobility
Step-ups → Explosive concentric power, improves stride and pedal economy
Leg Press → Alternative quad/glute strength builder when barbell lifts aren’t practical

Unilateral / Single-leg essentials:

Split Squat (Bulgarian or static) → Corrects imbalances, mimics running stride
Single-leg Romanian Deadlift → Posterior chain + balance, hamstring protection
Crossover Step-up / Lateral Lunge → Hip stability, adductor/abductor strength

💡 Why it matters: Endurance sports are repetitive and often asymmetrical. Single-leg lifts expose and correct imbalances that bilateral exercises may hide, improving economy and reducing overuse injury risk.

Accessory essentials for smaller but critical muscle groups

Calves (Standing Calf Raise, Soleus Raise) → Improves stride economy, reduces Achilles/calf injuries
Adductors (Copenhagen Plank, Adductor Machine) → Pelvic stability, protects groin during long runs
Abductors / Glute Medius (Side-lying leg raise, Banded walks) → Lateral hip stability, reduces IT-band issues
Core Stability (Anti-rotation Press, Dead-bug, Side Plank) → Transfers force efficiently, protects lower back

Useful machine-based options (when barbells aren’t ideal or for safe load under fatigue)

Leg Press / Hack Squat → Quad-dominant strength with controlled load
Leg Curl / Seated Hamstring Machine → Isolates hamstrings safely
Cable or Machine Row / Lat Pull-down → Upper-back strength, posture for long runs/rides
Hip Abduction/Adduction Machine → Direct targeting of stabilizers when extra support is needed

👉 Bottom line: Build your week around 1–2 main lifts (anterior + posterior), 1–2 single-leg lifts, and 2–3 accessories. Machines can be used as safe alternatives or add-ons, especially during high-volume endurance weeks.

Core essentials: abdominals & lower back strength

Anti-Rotation Press (Pallof Press) → Teaches the trunk to resist unwanted rotation, improving efficiency
Plank Variations (Front, Side, RKC Plank) → Isometric endurance for long-duration posture control
Dead-bug / Bird-dog → Dynamic stability, spine protection under movement
Hollow Hold / Hollow Rocks → Anterior core activation, builds stiffness for running economy
Back Extension (Floor, Roman Chair, or GHD) → Posterior chain + spinal erector endurance
Loaded Carries (Farmer’s Carry, Suitcase Carry) → Builds functional core stability under real-life loads

💡 Why it matters: A strong, stable core is the “bridge” that transfers force between upper and lower body. In endurance sports, it prevents energy leaks, delays fatigue, supports posture, and protects the spine during thousands of repetitive movements. A weak core often shows up as collapsing form in the late stages of long runs or rides.

Programming Tip

Include 2–3 core movements per session, mixing anterior, posterior, and anti-rotation patterns. Keep sets moderate (2–3) and avoid high-rep burnout — quality and stability matter more than volume.

👉 Bottom line: A durable core doesn’t just look good — it’s the foundation that holds your stride, your pedal stroke, and your swim stroke together when fatigue hits.

4) Rep/Set/Intensity Templates

Note on Periodization: Reps, sets, and intensity should adjust across the training year. During base and build phases, slightly higher loads (3–4 sets of 4–6 reps on major lifts) develop strength and power. As competition approaches, reduce volume to 2–3 sets and keep lifts heavy but brief, focusing on maintenance rather than progression. In recovery or deload weeks, keep weights light to moderate and cut total sets by ~30–40% to allow full adaptation.

Rep/Set Template by Training Phase Example

Base / Build(Strength Development)	Major lifts: 3–4 × 4–6 reps @ RPE 7–9 Accessories: 2–3 × 8–12 reps Core: 2–3 × 20–40 sec or 8–12 reps
In-Season (Maintenance)	Major lifts: 2–3 × 3–5 reps @ RPE 7–8 Accessories: 1–2 × 8–10 reps Core: 2 × 20–30 sec or 8–10 reps
Deload / Recovery	Major lifts: 2–3 × 4–6 reps @ RPE 5–6 Accessories: 1–2 × 8–12 reps (light) Core: 2 × 20 sec (easy effort)

Sample “Busy-Human” Weeks

Marathoner (6–7 runs/week)	Tue: AM intervals/threshold + PM strength (20–30 min) Thu: Tempo + PM strength top-up Sun: Long run (no heavy lifting within 24–48 hours prior)
Cyclist (4–6 rides/week)	Tue: VO₂/over-unders + PM strength Fri: Endurance/Z2 + Quick strength (RDL + row)
Triathlete (2–3 of each discipline/week)	Mon: Swim + Strength Thu: Bike intervals + PM quick strength Keep heavy leg lifts 36–48 h before key long runs

A 40-60 minute Professional, Coach-Approved Example

SESSION A	SESSION B
Warm-up (5–7 min) Easy cardio (bike, jog, row) 2 prep sets of bodyweight squats & hip hinge	Warm-up (5–7 min) Easy cardio (bike, jog, row )Mobility drills (hips + thoracic spine)
Main Lifts Back Squat — 4×6 @ RPE 7–8Hip Thrust — 3×6 @ RPE 7–8	Main Lifts Romanian Deadlift — 4×6 @ RPE 7–8Front Squat (lighter, upright posture) — 3×6 @ RPE 7
Unilateral Split Squat — 3×6/side	Unilateral Weighted step-up (medium box) — 3×8/side
Accessories Standing Calf Raise — 3×12Row (barbell, dumbbell, or machine) — 3×10	Accessories Soleus Raise (seated) — 3×12–15Lat Pull-down or Chin-up — 3×8–10
Core Pallof Press — 2×10/sideSide Plank — 2×25–30 sec/side	Core Dead-bug — 2×10/sideBack Extension (GHD or floor) — 2×12

Don’t forget: Safety First!

Ignore Aggressive Social-Media Playbooks. You don’t need maximal‑rep “grind sets,” quarter‑depth PRs, or flashy lifts to get faster. Stick to:

Gradual progression with proper technique
Full, controlled ranges your mobility supports
Stopping when form breaks
Avoiding extreme eccentric work or high-impact plyometrics when fatigued

The Practical Takeaway You Can Feel Good About

Two targeted strength sessions per week—done safely—make you more economical, more durable, and ultimately faster. If life requires cutting a run to fit in lifting? That’s still a smart move. Keep it focused. Keep it safe. Keep making every minute count.

The Science Behind It (Clickable for Curiosity)

**Running economy & durability:**
A 2025 randomized trial found 10 weeks of strength training significantly improved running economy under fatigue, with a 35% boost in time-to-exhaustion at ~95% VO₂max.
Read the Med Sci Sports Exerc RCT MDPI+15Health & HP+15PLOS+15 Fisiología del Ejercicio+11H.A.C.+11Loughborough University Repository+11
A similar study showed runners who added strength training held their economy better at the 90-minute mark, while endurance-only runners declined. Loughborough University Repository+3Marathon Handbook+3H.A.C.+3
Cycling performance gains:
A 2025 meta-analysis concluded heavy strength training significantly improved cycling efficiency, anaerobic power, and overall performance (time trial/time to exhaustion), even without VO₂max improvements. Fleet Feet+15High North Performance+15Paulo Gentil+15 Fisiología del Ejercicio+4SpringerLink+4H.A.C.+4
Improved running economy at high loads:
A systematic review shows high-load strength and plyometrics notably benefit running economy, especially at faster speeds in runners with already high VO₂max. MDPI+8SpringerLink+8Fisiología del Ejercicio+8
Swap vs. add flexibility:
Research indicates partially replacing endurance volume with explosive strength work can boost performance in trained cyclists. Loughborough University Repository+11sciencedirect.com+11Frontiers+11 H.A.C.+15ResearchGate+15Paulo Gentil+15
Injury resilience & durability:
While systematic reviews show strength training reduces injuries across sports, runner-specific findings are still emerging. Still, strength training clearly builds tissue capacity to sustain training loads. Loughborough University Repository renouvaud1.primo.exlibrisgroup.com+11SELF+11runbryanrun.com+11

Social Media Konstantinos Pallikaris – Matrix Endurance

Why Smart Strength Training Supercharges Endurance (and How to Fit It In) was last modified: October 1st, 2025 by Marilena Kokkinou