Why Single-Leg Strength Is the Missing Piece for St. George Runners
If you train on the Virgin River trails, log miles through Green Valley, or you're building mileage for the St. George Marathon, you've probably heard the standard advice: squat more, foam roll, stretch your hips. But here's the question most runners never ask — when does your leg ever work alone during a run?
The answer is every single stride. Running is a single-leg sport, and yet most gym-based strength routines are built around two-legged lifts. As a physical therapist working with runners throughout Southern Utah, this mismatch is one of the most common root causes I see behind knee pain, IT band irritation, and hamstring strains.
Why Two-Leg Strength Training Isn't Enough
A barbell squat is a great strength builder, but it doesn't ask your hip and knee to control themselves while your whole body weight balances on one foot — which is exactly what happens at every foot strike on the road or trail. Each landing sends roughly 2 to 3 times your body weight through a single leg. Without single-leg strength and control, that force has to go somewhere, and it's often the knee, IT band, or hamstring that pays the price.
4 Single-Leg Exercises Every Runner Should Know
Here's a sample of what we build into runner strength programs at Fortify. Start with body weight, prioritize slow and controlled reps over speed, and stop if you feel sharp joint pain (mild muscle burn is normal).
1. Single-Leg Step-Down (Quads)
Stand on a step 6–8 inches high. Slowly lower your opposite heel toward the floor by bending the standing knee, keeping your kneecap tracking over your toes. This trains the eccentric quad control that protects your knee at landing.
2. Single-Leg Glute Bridge (Glutes)
Lying on your back, drive through one heel to lift your hips into a bridge while the other leg stays extended. This builds the hip extension strength that powers you forward with every stride.
3. Single-Leg Hamstring Bridge, Feet Elevated (Hamstrings)
Heels up on a bench, lift into a bridge on one leg at a time. This loads the hamstring in a way that closely mimics the deceleration your leg does just before it strikes the ground.
4. Single-Leg Balance Reach (Core & Hip Control)
Standing on one leg, reach your opposite foot forward, out to the side, then behind you in a wide "Y" shape while keeping your standing knee steady. This trains the hip and trunk control that keeps your form efficient late in a long run.
How Often Should Runners Strength Train?
Two to three non-consecutive days per week is enough for most runners — think easy run days or rest days, not the day before a long run or speed workout. Pick one or two exercises per muscle group per session rather than trying to do everything at once, and give the same muscle groups about 48 hours to recover between sessions.
Get the Full Single-Leg Strength Program
We put together a complete, free guide with 12 single-leg exercises across quads, glutes, hamstrings, and core — including setup cues, dosage, and progressions for each one.
Download the Free PDF GuideWhen It's Time to See a Physical Therapist
If you're already dealing with knee pain, IT band tightness, or a hamstring that keeps nagging at you, self-guided strength work can only go so far. At Fortify Physical Therapy in St. George, we build individualized running strength and return-to-run programs based on your specific gait, strength deficits, and race goals — whether that goal is finishing the St. George Marathon or just running pain-free again.
Ready to run stronger? Call us at (435) 216-7929 or visit fortifyphysicaltherapy.com to schedule a running evaluation.
