Key strength training exercises for half marathon runners

Practical Playbook

1. 1

   Start strength work 12 weeks before race day.

   I've seen too many half marathon plans that pile on miles and ignore strength until something hurts. That's backward, and I learned it the hard way. You need 12 weeks of consistent lifting to build tendon resilience and running economy gains. Start with two sessions per week, each under 45 minutes. For me, single-leg work matters way more than heavy squatting. Your race pace won't come from leg press numbers.

2. 2

   How much lower body strength do you actually need?

   Not as much as you think. I see people obsessing over a 1.5x bodyweight squat for a half marathon, and honestly, that’s overkill. What actually matters is single-leg stability and keeping your form tight when your legs feel like jelly. My go-to? Eight to ten reps of Bulgarian split squats with solid technique, not grinding for a max. Your hips and glutes do the real driving here. If your knee drops inward during a lunge, I promise you’ll lose it at mile eight.

3. 3

   Schedule strength after easy runs, not hard ones.

   I’ve learned the hard way that hard running beats up your nervous system. Stack strength on top of that and you’ll crush recovery before you even get started. The sweet spot? Easy runs. Your body stays warm without getting trashed. I usually do 15-20 minutes of strength right after my run—my legs are already activated, so I skip the separate warm-up. Save leg day for after a recovery jog, not after intervals. Trust me, your body will thank you.

4. 4

   Cut strength volume during race week.

   Look, the taper is not the time to chase PRs. I cut my drop sets and intensity down to about 50%. One set per exercise is plenty to keep that neuromuscular connection alive without trashing my legs. Your body's job now is to pack in glycogen, not to repair shredded muscle. Honestly, I'd skip strength entirely in the last three days before race day. Fresh legs beat one extra lunge set every single time.

Common Mistakes

• Mistake

  Treating strength work as 'extra credit' you do when you feel like it.

  Why

  I rely on it for injury prevention and real power—this isn’t some optional add-on. Your half marathon rating? It lives or dies by this foundation.

  Fix

  I schedule two short strength sessions every week, and I give them the same priority as my long run. No skipping. That's non-negotiable for me.

• Mistake

  Lifting heavy every strength session because you want to 'get strong.'

  Why

  For a half marathon, I’ve found you don’t need max strength. You need muscular endurance and explosive power. Heavy lifting? It’ll drain your CNS and wreck your running legs. My own training dropped heavy squats three weeks out, and my pace actually improved.

  Fix

  I periodize my strength work by starting with heavier loads early in training. Then, as race day gets closer, I shift to higher reps and plyometrics. That's how I keep my legs fresh and explosive without burning out.

• Mistake

  Doing strength training right after your long run.

  Why

  I've been there. Your legs are absolutely fried after a heavy squat session, and I know from experience that trying to push through another workout just 4 hours later is a recipe for disaster. You'll start rounding your lower back, your knees will cave in, and suddenly you're staring at a pulled hamstring or worse. That's why I always separate my sessions by at least 6 hours. It gives my nervous system time to reset and my muscles a real shot at adaptation. Trust me, your body will thank you for the patience.

  Fix

  I’d strength train on a completely separate day, or if I’m doing a long run, I’ll hit the weights first thing in the morning. Then I leave at least half a day—like 12 hours—between those sessions. That gap keeps my legs fresh and my form sharp for both.

• Mistake

  Neglecting unilateral work — single-leg exercises.

  Why

  Running is a single-leg sport. I learned that the hard way after ignoring my weaker left side for months. Bilateral squats and deadlifts? They miss the asymmetry and stability demands entirely. That’s how your weak side turns into an injury, plain and simple.

  Fix

  I keep these four moves in my rotation every week: lunges, single-leg deadlifts, Bulgarian split squats, and step-ups. Twice a week, no exceptions. They're the reason my balance has stopped embarrassing me in the gym.

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