The Right Dose of Strength Training for Runners: Two Sessions a Week

If you're only doing one thing besides running to get faster, make it strength training — twice a week, full body, done consistently. That's the dose backed by research: enough to move the needle on running economy (studies show gains of 2-8%, which is a meaningful chunk of free speed) and enough to meaningfully lower injury risk, without piling on so much fatigue that it wrecks your running.

The mechanism isn't about building bigger muscles. It's about teaching your neuromuscular system to produce force more efficiently — better tendon stiffness, better motor unit recruitment, less energy wasted per stride. That shows up as running the same pace at a lower effort, or holding pace longer before you fade. The injury-prevention piece comes from strengthening the tissues that take repetitive load — hips, glutes, calves, single-leg stability — so they tolerate mileage better.

Where people get this wrong is either skipping it entirely ('I don't have time') or overdoing it (four-plus sessions, heavy leg days before hard runs). Research on runners consistently points to two sessions as the sweet spot — enough stimulus, not so much that it competes with running for recovery resources. The sessions don't need to be long. Twenty to thirty minutes of compound moves — squats, lunges, deadlifts or hinges, calf raises, single-leg work, some core — in the 8-15 rep range covers it.

Timing matters too. Strength sessions stacked right before a hard run or long run will blunt that session's quality. Better to strength train after a run, or on a day with an easy run, giving your legs a few hours to recover before you ask them to do anything else demanding.

Bottom line: twice a week, full body, compound lifts, not stacked before key runs. That's the evidence-backed baseline — not a nice-to-have, a foundational part of a runner's training week.