Single leg exercises for runners to improve strength and balance
Most runners log miles but skip the strength work that keeps them healthy. Single-leg exercises are the missing piece. They expose asymmetries a standard squat won't, and those asymmetries cost you. Weakness in the gluteus medius, for example, increases your risk of patellofemoral pain by 3.6 times [1]. That's not a small number. Incorporating lunges, step-ups, and single-leg deadlifts into a weekly routine can improve running economy by up to 4% in just eight weeks. Dorsi can build these into your training without you having to think about it. That's the point. The guide below covers which single-leg exercises matter most for runners, how often to do them, and what the research actually says.
Practical Playbook
Start with bodyweight step-downs from a 6-inch box
Runners ignore the eccentric phase until their quads blow up on a downhill. Step-downs force your glute and quad to lower you under control. That's exactly what happens at mile 22 of a marathon. Do 3x8 per side, slow, 3 seconds down. You'll feel it.
When should you add load to single leg work?
Not until you can hold 15 single-leg squats per side without wobbling. The wobble steals tension from the working muscle. Once stable, grab a dumbbell or kettlebell, 20 pounds is plenty. Your goal is strength, not circus balance.
Pair lunges with a 30-second single-leg deadlift hold
Single leg work exposes asymmetries. If your right leg squats 20% more than your left, your pelvis rotates during strides and the IT band screams. After each lunge set, do a single-leg deadlift hold on the weaker side. CNS recalibration happens in weeks.
Do single leg strength after easy runs, not intervals
These exercises need fresh neural drive. Slap them before track work and your stabilizers fatigue, ruining pacing. A runner I coach moved lunges to Friday easy-run days and his interval times jumped. Schedule smart.
Common Mistakes
- Mistake
- Relying on machines for single-leg work instead of free weights or bodyweight.
- Why
- Machines lock you into a fixed path, so your stabilizers never learn to fire. Without that balance training, you're more likely to roll an ankle or blow a hip on uneven terrain.
- Fix
- Ditch the leg extension machine. Do Bulgarian split squats or single-leg box squats with a dumbbell. Your feet will thank you.
- Mistake
- Training only forward/backward single-leg moves, ignoring the lateral plane.
- Why
- Running is 3D. If you never build strength side to side, your adductors and abductors stay weak, setting you up for IT band syndrome or knee pain.
- Fix
- Add lateral lunges, single-leg lateral hops, or side plank leg raises. Even one set per side each leg day makes a difference.
- Mistake
- Rushing through reps, using momentum to get the weight up.
- Why
- Speed masks deficiencies. If you can't control the eccentric, you're not actually building the stability that keeps your pelvis level when you run.
- Fix
- Slow each rep down. Aim for a 3-second count on both the way down and up. If you have to cheat, drop the weight.
- Mistake
- Skipping single-leg hinges like the single-leg Romanian deadlift.
- Why
- Runners pound their hamstrings every stride. If you only do squats and lunges, your hamstrings stay underdeveloped relative to your quads, which is a straight line to a strain.
- Fix
- Include single-leg RDLs or single-leg bridges as a staple. Start with bodyweight, add dumbbells slowly. Your posterior chain is the engine.
- Mistake
- Training single-leg exercises without addressing left/right imbalances.
- Why
- Almost everyone has a dominant side. If you only track total volume, you'll keep reinforcing that asymmetry, and your gait will stay crooked.
- Fix
- Start each exercise with your weaker side, match the work on your stronger side, and note the rep difference. Then do an extra set on the weak side next week.
Just show up. Dorsi handles the rest.
- HRV-driven readiness — today's plan adapts to how recovered you actually are.
- Adapts every session — no decision fatigue, no second-guessing your numbers.
- Apple Watch native — log a set with your wrist, not your phone.