Runners don't get injured because they're weak at running. They get injured because they're weak at everything else.
Running is a long series of single-leg hops. Each one lands with two to three times your bodyweight going through one leg, and something has to control that. If nothing does, your knees and shins take it instead.
Strength training for runners is not about getting big or lifting heavy. It is about being able to hold your hips level and your knee tracking straight, for twenty thousand hops in a row.
The evidence is unusually good
Most injury-prevention advice is guesswork. This one is not: adding strength work roughly halves overuse injury rates across a range of studies, and it improves running economy — you use less oxygen at the same pace — which nothing else on this list does as directly.
What to actually do
Twice a week, twenty minutes, after an easy run or on a rest day. No gym needed.
Hips and glutes — the part that matters most and gets skipped most:
- Single-leg glute bridges — 3 × 10 each side
- Side-lying leg raises or a band walk — 3 × 15 each side
- Step-ups onto a chair or a bench, slow and controlled — 3 × 8 each side
Legs:
- Squats, bodyweight to begin with — 3 × 12
- Split squats or lunges — 3 × 8 each side
- Calf raises, both legs then one — 3 × 15. Do not skip these: the calf and Achilles take an enormous share of the load.
Core, meaning anti-movement rather than sit-ups:
- Plank — 3 × 30–45 seconds
- Side plank — 3 × 20–30 seconds each side
- Dead bug — 3 × 10 each side
How to fit it in
Hard days hard, easy days easy applies here too: put strength work on a day you already ran, rather than on a rest day, so the rest day is genuinely a rest day.
Start with one set of each and build. Expect to be sore for about a week and then not.
Somebody in the chat proposed intervals plus calisthenics as a weekly fixture back in March. They were right.