Runners should lift weights. Done right, strength training improves running economy (you use less energy at the same pace), builds the tissue tolerance that prevents the most common overuse injuries, and adds power for hills and finishing kicks — without adding bulk or slowing you down. Two focused sessions a week is enough for most runners.
Ask a room of runners why they don't lift weights and you'll hear the same handful of reasons. It'll make me bulky. It'll make me slow. Running is my training — I don't need the gym. Every one of those is wrong, and believing them is why so many runners spend their seasons hurt, stalled, or both.
Strength training is not the enemy of running. It is one of the most reliable ways to run faster, longer, and healthier — and the research and the injury reports both agree.
Does Lifting Make Runners Bulky and Slow?
No. This is the myth that has to die first. Building large amounts of muscle takes enormous volume, specific training, and usually a lot of extra food — the opposite of what a runner does. A runner who lifts twice a week is not going to wake up bulky. They are going to get stronger without meaningful size, which is exactly what you want: more force from the same frame.
And slow? It is the reverse. Stronger muscles and tendons return energy more efficiently with every stride. That is the whole point.
Strength does not compete with your running. It makes every stride cost less.
The Real Payoff: Running Economy
Running economy is how much energy you burn to hold a given pace. Improve it and you run the same speed for less effort — or a faster speed for the same effort. It is one of the biggest separators between runners, and strength training is one of the few proven ways to move it.
When your legs are stronger and your tendons stiffer in the useful sense, your stride stores and returns more energy on its own. You lean less on raw aerobic effort. Late in a race, when the economical runner still has form and the weak one is falling apart, that difference is the whole story.
Where Strength Saves Your Season
Most running injuries are not freak accidents. They are overuse — the same tissue absorbing the same load thousands of times until it fails. Shin pain, runner's knee, Achilles and calf issues, IT band problems. The common thread is tissue that could not tolerate the repeated load.
Strength training builds that tolerance. Stronger muscles, tendons, and the connective tissue around your joints handle repetitive impact far better. For a runner, the gym is not just performance — it is the difference between training through a season and watching it from the couch.
- Stronger hips and glutes control the knee and cut down on runner's knee and IT band pain
- Robust calves and Achilles tolerate the repeated impact that causes so many breakdowns
- A stronger, more stable trunk keeps your form together when you fatigue
- Single-leg strength exposes and fixes the left-to-right imbalances that overuse loves to exploit
The gym is not extra work. It is what keeps you running.
What It Actually Looks Like
Runners do not need a bodybuilder's schedule. For most, two focused sessions a week is plenty — heavier, lower-rep strength work built around big patterns (squat, hinge, single-leg, push, pull) plus a little power. Not endless circuits. Not "tone." Real strength, programmed so it supports your running instead of burying it under junk fatigue.
The sequencing matters too: you protect your hard runs and your hard lifts from stepping on each other. That is a programming problem, and it is exactly the kind of thing an assessment sorts out — what you are strong at, where you are exposed, and how to fit it around your mileage.
The Bottom Line
Runners who lift get faster, hold form longer, and get hurt less. Runners who refuse to lift leave performance on the table and keep meeting the same injuries. The gym does not make you a worse runner. It makes you a runner who is still running next season.
Two days a week. Real strength. It might be the best thing you ever do for your running.
Frequently Asked Questions
How many days a week should a runner lift weights?
For most runners, two strength sessions a week is enough to improve running economy and prevent injury without interfering with mileage. Keep the sessions focused and heavier rather than long and exhausting.
Will lifting weights make me a slower runner?
No. Strength training improves running economy, meaning you use less energy at the same pace. Runners who lift typically get faster, not slower, especially late in races when form and power matter most.
Should runners lift heavy or do high reps?
Runners generally benefit more from heavier, lower-rep strength work than from high-rep circuits. Heavier lifting builds strength and tissue tolerance with minimal added muscle size, which is exactly what a runner wants.
Can strength training prevent running injuries?
Yes. Most running injuries are overuse injuries caused by tissue that cannot tolerate repeated load. Strength training builds the tolerance in muscles, tendons, and connective tissue that reduces the risk of shin pain, runner's knee, Achilles problems, and IT band issues.
Build a Strength Plan Around Your Running.
FPC assessments show exactly where you are strong, where you are exposed, and how to fit strength work around your mileage. Start with an assessment and run your best season yet.
Book Free Assessment →