Strength Training for Runners: What to Do and When

Many runners avoid the weight room because they fear getting bulky or tired legs. In reality, sensible strength training is one of the most useful things a runner can add. It can improve running economy, help muscles and tendons handle the repetitive impact of running, and is commonly used to reduce injury risk.

What Runners Gain

• Resilience: stronger muscles and tendons tolerate training load better.
• Running economy: stronger legs can mean less energy used at a given pace.
• Finishing power: better ability to hold form and push late in races.

Building noticeable muscle mass requires a lot of targeted training and food. Two short strength sessions a week alongside running will not make you bulky.

Key Exercises

• Squats or split squats: quads and glutes, the main propulsion muscles.
• Romanian deadlifts or hip thrusts: hamstrings and glutes.
• Calf raises: straight-knee and bent-knee versions. Calves take enormous load in running. See our calf training guide.
• Step-ups and single-leg work: running happens one leg at a time.
• Core: side planks, dead bugs and carries for a stable trunk.

Heavy or Light?

Runners benefit from genuinely challenging strength work, not just light high-rep circuits. Sets of 4 to 8 reps with a weight that leaves one to three reps in reserve build strength without much muscle gain or soreness once you are used to it. Start lighter during the first few weeks.

When to Lift

• Twice a week is enough for most runners; once a week maintains strength in peak race periods.
• Put strength sessions on hard running days (after the run, or later the same day) so easy days stay easy.
• Avoid heavy leg sessions the day before a key workout or long run.

Getting Started

Begin with bodyweight and light dumbbells for two to three weeks, then build load gradually. Expect a little leg soreness at first; it fades as your body adapts. If you are new to running too, start with our running for beginners guide.