Quick Answer: Your hamstrings are not getting sore because most leg-day exercises do not load them in a lengthened position under tension. Squats, lunges and leg presses are knee-dominant, and the hamstring’s biggest soreness driver is eccentric work at long muscle length — Romanian deadlifts, Nordic curls and good mornings. Add one lengthened-position hamstring exercise and the problem resolves within a session.

Quads: destroyed. Glutes: definitely worked.

Hamstrings: as if you had spent the evening on the sofa.

That is not a mystery. It is a programming gap with a very short list of causes.

Why do squats barely touch the hamstrings?

Because of what happens at both ends of the muscle at the same time.

The hamstrings cross two joints. They extend the hip and flex the knee. In a squat, the hip extends (shortening them at the top end) while the knee also extends (lengthening them at the bottom end).

Those two actions largely cancel out. The overall length change across a squat is small, which means the hamstring works mostly as a stabiliser rather than a prime mover. Small length change means little eccentric loading.

Soreness comes mainly from eccentric work at long lengths. Muscle damage — and therefore delayed onset soreness — is driven most by lengthening under load, particularly at long muscle lengths. Squats provide very little of that for the hamstrings.

Lunges and leg presses have the same issue. Both are knee-dominant, both keep the hamstring near a constant length.

The quads do get all of it. They lengthen substantially under load in a squat, which is exactly why the soreness lands there.

This is not a failure of your squat. It is a correct description of what the exercise does. The gap is in the rest of the programme.

What actually makes hamstrings sore?

A short list, and all of it involves length under tension.

Romanian deadlifts. The single best general-purpose option. Hips travel back, knees stay softly bent, and the hamstrings lengthen under load through a large range. Depth is limited by hamstring length, not by touching the floor.

Nordic hamstring curls. Extremely effective and extremely humbling. Eccentric knee flexion at long length, and the exercise with the strongest evidence base for hamstring injury reduction. Start with a very small range and a band or hands assisting.

Good mornings. Similar mechanics to the RDL with the load on the back, which many people find easier to feel.

Single-leg RDLs. Add a balance and stability demand, and often produce more hamstring sensation at much lower load.

Seated and lying leg curls. Genuinely useful, but the seated version trains the hamstring at longer muscle length and is generally the better choice for growth.

Slow eccentrics on any of them. Three to four seconds on the lowering phase substantially increases the stimulus without adding weight.

Stiff-leg deadlifts with a deficit. Standing on a plate extends the range and the lengthened position further. Advanced, and effective.

How should you actually programme it?

One dedicated hamstring exercise, treated as a main lift rather than an afterthought.

Put a hinge in every leg session. Squat plus hinge is the minimum complete lower body pairing. A leg day without a hinge is a quad day.

Do the hamstring work early, not last. Fatigued hamstrings at the end of a session get sloppy reps, and the hinge is the pattern where technique matters most.

Three to four sets of six to twelve reps. Standard hypertrophy ranges apply. Hamstrings do not need special rep schemes.

Control the eccentric deliberately. Three seconds down is the single highest-value cue. Most people lower an RDL in under a second and wonder why nothing happens.

Stop when your back rounds, not when the weight touches. Range is set by hamstring flexibility. Going past it just moves the work to the lumbar spine.

Add Nordics twice a week, low volume. Two sets of three to five slow reps is a real dose. Expect severe soreness the first week and much less by the third.

Feel for a stretch, not a pump. The sensation of a good RDL is a strong lengthening feeling in the back of the thigh at the bottom, not a burn.

Expect the first session to hurt for days. Hamstring soreness from a first Nordic or deficit RDL session is legendary and it fades fast with repeated exposure.

Seasonal note: hamstring strains rise when people move indoors and increase running speed on treadmills through autumn. Adding eccentric hamstring work now is well-timed protection, not just aesthetics.

5 Mistakes Everyone Makes With Hamstring Training

1. Assuming squats cover it. They do not, for the reason described above. Squats are a quad exercise with glute involvement.

2. Turning the RDL into a squat. Bending the knees progressively through the rep removes the hamstring loading entirely. Knees stay softly bent and roughly fixed; the hips travel back.

3. Going too heavy to control the eccentric. If the bar is falling rather than being lowered, the most valuable part of the rep is gone.

4. Only doing lying leg curls. Useful, but they train the hamstring at a relatively short length. The lengthened-position work is where the soreness and most of the growth come from.

5. Chasing range by rounding the back. Extra centimetres bought with lumbar flexion are not hamstring range, and they are how people hurt themselves on this exercise.

FAQ: Hamstring Questions, Answered

Does soreness mean it worked?

Not reliably. Soreness indicates novel eccentric stress, not necessarily a better stimulus. But a complete absence of soreness from a muscle you are supposedly training every week is a signal worth reading.

How often should I train hamstrings?

Twice a week is a good target for most people, with at least one lengthened-position exercise each time.

Why do my hamstrings cramp during leg curls?

Commonly a combination of relative weakness, position and fatigue. Reducing load, shortening range slightly, and warming up the hinge pattern first usually resolves it.

Are Nordics safe if I am a beginner?

Start with assisted or band-supported versions and a very small range. The eccentric load is high, and the first session should feel almost too easy.

Should I stretch my hamstrings if they feel tight?

Strengthening through range usually improves the tight feeling more than static stretching does, especially if the tightness is protective.

Do hamstrings recover slower than quads?

After heavy eccentric work, often yes — 48 to 72 hours is common. Programme accordingly rather than doing Nordics the day before a run.

TL;DR:

• Squats keep the hamstrings at near-constant length — that is why nothing happens.
• Soreness comes from eccentric loading at long muscle length: RDLs, Nordics, good mornings.
• Put a hinge in every leg session, early, and control the eccentric for three seconds.
• Range is limited by your hamstrings, not by touching the floor.
• Two sets of slow Nordics twice a week is a genuine dose.

Add one RDL with a three-second lowering phase this week. You will know by Thursday.