Classified as a pull pattern, the Mts Iso-lateral Kneeling Leg Curl loads the hamstrings through selectorized machine. The working muscles contribute to the movement, which is what makes this movement valuable for overall performance in this pattern. What separates this variation from other hamstrings work is that it is performed from a kneeling position — a detail that changes which fibres take the load and how much stability the movement demands. The 'Mts Iso lateral Kneeling' element in the name is the part that matters technically — it defines the exact position and path this version uses, and swapping it changes the training effect. Support comes from the calves and glutes; the calves in particular help point the foot downward at the ankle, which is why fatigue there often shows up before the hamstrings is fully worked. Training this with selectorized machine makes load changes instant and keeps the movement path stable, though it may not fit every limb length despite adjustment. Programme it alongside your other hamstrings work rather than as a standalone. The pattern is accessible enough to learn in a single session, which makes it a sound entry point before progressing to heavier or more complex variations.
Muscles Worked
The Mts Iso-lateral Kneeling Leg Curl is primarily a legs exercise, but it is never only the legs doing the work.
Legs
75%
Calves
42%
Glutes
32%
Legs (primary) — These fibres contribute to the movement, and they carry the majority of the load in this movement.
Calves (secondary) — Assists by helping to point the foot downward at the ankle, contributing to ankle stiffness, walking and jumping mechanics.
Glutes (secondary) — Assists by helping to extend and externally rotate the hip, contributing to hip power, posture and lower-back protection.
Benefits of the Mts Iso-lateral Kneeling Leg Curl
Allows progressive overload — adding load or repetitions over weeks is what actually drives hamstrings growth.
Uses selectorized machine, which makes load changes instant and keeps the movement path stable.
Builds strength in the hamstrings through a pull pattern, which carries over directly to drawing resistance toward your torso.
Reinforces the lats, mid-back, rear delts and biceps as a coordinated unit rather than as isolated parts.
Working from a kneeling position shifts emphasis onto fibres that standard variations under-train.
How to Perform the Mts Iso-lateral Kneeling Leg Curl
1
Kneel with your hips stacked over your knees and your ribs down, holding the handles.
2
Begin by drawing your shoulder blade toward your spine, then pull the handles toward you.
3
Pull until your hamstrings is fully shortened and hold that position for a beat.
4
Check yourself midway through the Mts Iso-lateral Kneeling Leg Curl: the handles should be moving at a steady speed, not accelerating.
5
Return to the start under control, letting the arm straighten without losing tension.
6
Keep every rep at the same tempo — when speed drops noticeably, end the set.
Your Goal General Fitness
Sets
2–3
Reps
10–15
Rest
60s
Breathing Technique
The general rule for the Mts Iso-lateral Kneeling Leg Curl is simple: inhale on the lowering phase, exhale as you pull. For heavier sets, take a breath in at the start position, brace as though bracing for a punch, and hold that pressure through the hardest part of the rep before exhaling. Consistent breathing is what keeps your brace intact from the first rep to the last.
Tips for Proper Form
Set your position before the first rep rather than correcting it mid-set.
Re-check a kneeling position between sets; it tends to creep as you fatigue.
Keep the range of motion consistent across every rep so you can compare sessions honestly.
Control the lowering phase — most of the hamstrings stimulus comes from resisting the weight, not lifting it.
Lead with the elbow rather than the hand so the back does the work instead of the arms.
Start every rep by pulling your shoulder blade toward your spine, then let the arm follow. Leading with the hand makes this a biceps exercise.
A useful check on the Mts Iso-lateral Kneeling Leg Curl: if you can't pause for a full second at the hardest point of the rep, the difficulty is beyond what the hamstrings can currently control.
Adjust the seat so the pivot lines up with your joint — a bad setting quietly moves the work off the hamstrings.
Common Mistakes to Avoid
Using bodyweight swing to move the load.
Do this insteadAnchor your torso and slow the tempo. If you can't move it without swinging, it's too heavy.
Treating the Mts Iso-lateral Kneeling Leg Curl as a warm-up movement and never progressing it.
Do this insteadGive it real working sets — the hamstrings needs a genuine stimulus, not a token effort.
Setting the range-of-motion stops too conservatively.
Do this insteadUse as much range as you can control so the hamstrings works through its full length.
Variations by Experience Level
Beginner
Perform the movement slowly with a light load until the pattern feels automatic. If selectorized machine feels unmanageable, rehearse the same pattern with bodyweight first. Stay at this level until every Mts Iso-lateral Kneeling Leg Curl rep looks the same as the first.
Intermediate
Add load in small increments while holding the same tempo and range you established. Alternate harder and easier Mts Iso-lateral Kneeling Leg Curl sessions rather than pushing every one.
Advanced
Progress to a heavier variation of the same pattern once technique is stable at your current load. At this level the Mts Iso-lateral Kneeling Leg Curl is best programmed after your heaviest hamstrings work, not before it.
Safety Considerations
Stop the set when technique degrades — a Mts Iso-lateral Kneeling Leg Curl rep that no longer looks like your first one is not building anything.
The most common way the Mts Iso-lateral Kneeling Leg Curl goes wrong is using momentum from the lower back to swing the weight.
Because this is performed from a kneeling position, confirm the setup is secure and stable before loading it.
Warm up with lighter sets of the Mts Iso-lateral Kneeling Leg Curl before your first working set.
Who Should Avoid This Exercise
The Mts Iso-lateral Kneeling Leg Curl suits most healthy trainees, but it is not appropriate for everyone.
Anyone experiencing sharp, localised or radiating pain during the movement — that is a signal to stop, not to push through.
Anyone with an acute lower-back injury or disc irritation, until cleared to load the spine again.
This is general educational information, not medical advice. If you are managing an injury or medical condition, check with a qualified professional before adding this exercise to your programme.
What muscles does the Mts Iso-lateral Kneeling Leg Curl work?
It primarily trains the legs, with the calves and glutes assisting. The pattern is classified as pull, so the lats, mid-back, rear delts and biceps share the workload.
Is the Mts Iso-lateral Kneeling Leg Curl suitable for beginners?
Yes. It is rated beginner-level, and the pattern can usually be learned in a single session with light resistance.
How many sets and reps should I do?
A practical starting point is 3 sets of 10-12, resting 60-90 sec between sets, roughly 2x per week. Adjust from there based on how you recover.
What equipment do I need for the Mts Iso-lateral Kneeling Leg Curl?
You need selectorized machine. This makes load changes instant and keeps the movement path stable, though it may not fit every limb length despite adjustment.
How do I breathe during the Mts Iso-lateral Kneeling Leg Curl?
As a general rule, inhale on the lowering phase, exhale as you pull. Avoid holding your breath for the entire set.
What is the most common mistake with the Mts Iso-lateral Kneeling Leg Curl?
Using momentum from the lower back to swing the weight. The simplest correction is to lead with the elbow rather than the hand so the back does the work instead of the arms.
What can I do instead of the Mts Iso-lateral Kneeling Leg Curl?
Good substitutes that train the same hamstrings pattern include Standing Leg Elevated Hamstring Stretch, Dumbbell Straight Leg Deadlift, and Resistance Band Kneeling Leg Half Circle. Pick whichever matches the equipment you have available.
Why perform this from a kneeling position?
Changing the angle changes which fibres of the legs take the most tension, so it complements rather than duplicates your other hamstrings work.
About Training Your Hamstrings
Where the Mts Iso-lateral Kneeling Leg Curl earns its place is repeatability — selectorized machine makes the setup easy to reproduce, which is what lets you actually progress the hamstrings.
The hamstrings run down the back of the thigh and perform two jobs: bending the knee and extending the hip. Strong hamstrings balance the quads, protect the knee, and are essential for sprinting and powerful hip extension.
Train them with two movement types. Knee-flexion work — lying and seated leg curls — targets the hamstrings directly, while hip-hinge movements like the Romanian deadlift, good morning, and Nordic curl load them through a powerful stretch. Combining both builds fuller, more resilient hamstrings than curls alone.
On hinges, push the hips back with a flat back and feel the stretch rather than rounding the spine. A slow lowering phase dramatically increases the training effect.