Strong hamstrings make you a more efficient, more injury-resistant runner. These muscles do their hardest work during the late swing phase of your stride, when your leg is reaching forward and your hamstrings are lengthening under heavy load to decelerate the shin before your foot strikes the ground. That braking action is eccentric, meaning the muscle is working while being stretched, and it’s both the most demanding thing your hamstrings do and the moment they’re most vulnerable to strain. A good hamstring program for runners trains that eccentric capacity specifically, balances hip-dominant and knee-dominant movements, and fits into your weekly running schedule without wrecking your recovery.
Why Hamstrings Matter More Than You Think
Your hamstrings cross two joints: the hip and the knee. During running, they lengthen under load from roughly 50% to 90% of each stride cycle, absorbing the inertial forces of your swinging leg, then shorten to help propel you forward through stance. Research published in Medicine & Science in Sports & Exercise found that the negative (eccentric) work hamstrings perform increases significantly as you run faster, which is why hamstring strains tend to happen during speed work, race finishes, or the final miles of a long run when fatigue sets in.
Eccentric hamstring endurance also correlates with running economy. Runners with better eccentric strength in their knee flexors use less energy at a given pace and resist the form breakdown that comes with fatigue. In practical terms, stronger hamstrings help you hold your stride together when you’re tired.
A useful benchmark: your hamstring strength should be roughly 50% to 80% of your quadriceps strength. If that ratio is significantly low, your quads overpower the back of your leg, increasing strain on both the hamstring and the knee joint. You can get this tested with isokinetic equipment at a sports physical therapy clinic, but even without formal testing, consistently training your hamstrings is the simplest way to keep the ratio in a healthy range.
The Exercises That Work Best
Nordic Hamstring Curls
This is the single most evidence-backed exercise for hamstring injury prevention. A systematic review of over 8,400 athletes found that programs including Nordic hamstring curls cut hamstring injury rates by 51%. You kneel on the ground with your feet anchored (under a couch, a loaded barbell, or held by a partner), then slowly lower your torso toward the floor, resisting gravity with your hamstrings for as long as possible. The eccentric lowering phase is the point. You catch yourself with your hands and push back up to repeat.
Start with 2 sets of 3 to 5 reps if you’ve never done them. The soreness can be intense the first week. Over several weeks, work toward 3 sets of 6 to 8 reps. If you can control the full descent for 3 to 4 seconds, your eccentric strength is in good shape.
Romanian Deadlifts
The Romanian deadlift (RDL) is a hip-dominant exercise, meaning it loads the hamstrings primarily at the hip rather than the knee. You hinge forward at the hips with a slight knee bend, lowering a weight (or just your body) until you feel a deep stretch in the back of your thighs, then drive your hips forward to stand. The biomechanics closely simulate the late swing phase of running, where hip torque is greatest while the hip is flexed. Studies show the RDL produces strong hamstring activation, particularly in the lengthened position, which is exactly the range where injuries happen.
Use dumbbells, a barbell, or a kettlebell. If you’re new to the movement, a single-leg bodyweight RDL is a great starting point: 2 to 3 sets of 8 to 12 reps per leg. The single-leg version also builds the balance and hip stability that running demands.
Single-Leg Glute Bridges
Lie on your back with one foot flat on the floor (or elevated on a step) and the other leg extended straight. Drive through your heel to lift your hips. This targets the hamstrings and glutes together, which is how they function during the stance phase of running. For more hamstring emphasis, place your foot farther from your body so your leg is straighter. Aim for 2 to 3 sets of 8 to 12 reps per side.
Hamstring Slides
These are an excellent eccentric option you can do at home with socks on a hard floor or a towel on tile. Lie on your back with both heels on the slippery surface, lift your hips into a bridge, then slowly slide your feet away from your body until your legs are nearly straight. Pull them back in. The slow extension is what builds eccentric control. Start with 2 to 3 sets of 8 to 12 reps.
Balancing Hip and Knee Movements
Your hamstrings have two jobs: extending the hip and flexing the knee. No single exercise trains both functions equally, so your program needs at least one hip-dominant exercise (like RDLs or good mornings) and one knee-dominant exercise (like Nordics, hamstring slides, or prone leg curls). Runners who only do RDLs leave the lower portion of their hamstrings, closer to the knee, undertrained. Runners who only do leg curls miss the hip-extension strength that matters during propulsion and late swing.
A simple weekly template: pair one hip-dominant and one knee-dominant hamstring exercise in each session. Two exercises, 2 to 3 sets each, is enough to produce meaningful strength gains without turning your strength day into a bodybuilding workout.
How Often to Train
Two to three strength sessions per week is the sweet spot for runners. Beginners should start with two sessions and add a third as they adapt. You don’t need a dedicated “hamstring day.” Fold hamstring work into a general lower-body or full-body routine that also hits your glutes, calves, and core.
Timing matters. If you strength train and run on the same day, make the following day a rest or easy cross-training day. Running on heavily fatigued hamstrings defeats the purpose: your form breaks down, your eccentric control drops, and your injury risk goes up instead of down. Many runners prefer to do their hard run and strength session on the same day, keeping their easy days truly easy.
Expect noticeable strength gains within 4 to 6 weeks of consistent work. Eccentric strength, which is the type most protective for runners, adapts a bit more slowly because it involves structural changes in the muscle fibers themselves. Give it 8 to 12 weeks before judging results.
Warming Up Your Hamstrings Before a Run
Dynamic stretching before a run increases hamstring range of motion and decreases passive stiffness, and those effects persist long enough to cover your run. A simple protocol: standing or walking leg swings, progressively increasing the range, for about 10 to 15 repetitions per leg. Research shows that dynamic stretching also temporarily raises your pain-free stretch threshold by about 10%, meaning your hamstrings tolerate more lengthening before signaling discomfort.
Save static stretching for after the run. Static holds before running can temporarily reduce force production, which is the opposite of what you want when you’re about to ask your hamstrings to absorb high eccentric loads stride after stride.
A Sample Weekly Plan
Here’s how hamstring training can fit into a typical running week:
- Session A (e.g., Monday): Romanian deadlifts, 3 sets of 8 to 10 reps. Nordic hamstring curls, 3 sets of 4 to 6 reps.
- Session B (e.g., Thursday): Single-leg glute bridges, 3 sets of 10 to 12 reps per side. Hamstring slides, 3 sets of 8 to 10 reps.
Session A uses heavier loading and emphasizes both hip-dominant and knee-dominant patterns. Session B is lighter and more bodyweight-focused, making it easier to recover from. Both sessions together take 15 to 20 minutes. You can add them to the end of an easy run or pair them with other lower-body and core work in a standalone strength session.
As you get stronger, progress by adding weight to the RDLs, slowing down the eccentric phase of Nordics, or elevating your feet during bridges. The goal isn’t to lift the heaviest weight possible. It’s to build the kind of resilient, fatigue-resistant eccentric strength that keeps your hamstrings healthy mile after mile.