Smith Rear Lunge (Version 2)
The Smith Rear Lunge (Version 2) is a compound movement that trains the quadriceps with help from glutes and hamstrings. This guide covers the setup, the execution, the mistakes worth fixing early, and how to program it.
The lunge loads one leg at a time through a long stride, which trains the quadriceps hard while demanding balance and control at the hip. It exposes side-to-side differences a two-legged movement hides, and it does so with far less load on the spine.
Who it is for. Anyone past their first few weeks of training. It belongs after your main squat or hinge, as the movement that does the single-leg work.
Muscles worked
The prime mover here is the quadriceps, with glutes and hamstrings assisting — which is why this movement earns its place as more than a single-muscle exercise.
Front
Back- Vastus lateralis100%
- Vastus medialis82%
- Rectus femoris40%
- Gluteus maximus50%
- Biceps femoris50%
- Semitendinosus50%
How to do it
- Stand tall holding a machine, feet about hip-width, and brace your midsection.
- Take a stride long enough that when you go down, the front shin stays close to vertical and the back knee has room to travel.
- Keep your torso upright with your weight balanced through the front foot.
- Lower straight down by bending both knees until the back knee is just above the floor and the front thigh is about parallel.
- Keep most of your weight on the front leg — the back leg is there for balance, not to push.
- Drive up through the front heel to return to the start, finishing all the reps on one side before switching.
Breathing. Breathe in on the way down, out as you drive back up to standing.
Form cues that matter
- Down, not forward — think of the back knee dropping to the floor.
- Front heel stays glued down through the whole rep.
- Keep your hips square; do not let one side rotate ahead of the other.
- A stride too short, so the front knee shoots well past the toes
- Pushing off the back foot to stand up
Common mistakes
| The mistake | Do this instead |
|---|---|
| A stride too short, so the front knee shoots well past the toes | Step further out so the shin stays near vertical at the bottom. |
| Pushing off the back foot to stand up | Consciously drive through the front heel; lighten the load until you can. |
| Wobbling and losing the line | Slow the descent down, and hold a rack or wall with one hand while you learn the pattern. |
What makes this variation different
The Smith Rear Lunge (Version 2) is a specific version of this movement, and the details in its name change how it should be performed.
- A machine fixes the path for you, which removes the balance demand and lets you push closer to failure safely. Set the seat and the pivot to your body first — a badly adjusted machine puts the load on a joint instead of the muscle.
- The Smith machine fixes the bar path, which removes the balance demand and lets you push closer to failure on your own. The trade-off is that the fixed path has to match your natural one, so set your foot or bench position carefully.
Sets, reps and rest
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Strength | 3-5 | 5-8 per leg | 90-120 s |
| Muscle growth | 3-4 | 8-15 per leg | 90-120 s |
| Endurance | 2-3 | 15-25 per leg | 90-120 s |
- 6-12Weekly sets
- 2-0-1Tempo
- 90-120 sRest
How to progress
Add weight before you add reps. Work at the top of your rep range for two sessions in a row with clean technique, then put the smallest increment available on the Smith Rear Lunge (Version 2) and build back up. Small, boring jumps beat big ones.
Variations and alternatives
If you do not have the equipment, or you simply want to rotate the stimulus, these 8 movements train the quadriceps in a similar way.
- Barbell Lunge — Barbell
- Dumbbell Split Squat — Dumbbell
- Barbell Curtsey Lunge — Barbell
- Barbell Front Rack Split Squat — Barbell
- Barbell Lateral Lunge — Barbell
- Barbell Rear Lunge — Barbell
- Barbell Single Leg Split Squat — Barbell
- Barbell Split Squat — Barbell
Safety
Key takeaways
- Down, not forward — think of the back knee dropping to the floor.
- Front heel stays glued down through the whole rep.
- Work in the 8-15 per leg rep range for muscle growth, leaving a rep or two in reserve on most sets.
- Full range of motion on the Smith Rear Lunge (Version 2) matters more than the weight on it.
- Progress gradually and keep technique identical as the load goes up.
Go deeper
FAQ
What muscles does the Smith Rear Lunge (Version 2) work?
It works the quadriceps as the prime mover, with glutes and hamstrings assisting. The midsection also works throughout to keep you stable.
How many sets and reps should I do on the Smith Rear Lunge (Version 2)?
Three to four working sets of 8-15 per leg reps suits most people training for muscle growth, leaving one or two reps in reserve. Across all the exercises that train this muscle, 6-12 hard sets a week is a productive range.
Is the Smith Rear Lunge (Version 2) good for beginners?
Yes, provided you start light enough to own the technique. Spend the first few weeks on the movement itself with a load you could do several more reps with, and add weight only once the pattern is automatic.
What can I do instead of the Smith Rear Lunge (Version 2)?
Barbell Lunge, Dumbbell Split Squat and Barbell Curtsey Lunge all train the quadriceps in a similar way, so any of them works as a substitute when the equipment is taken or you want to rotate the stimulus.
What equipment do I need for the Smith Rear Lunge (Version 2)?
This version uses a machine. The pattern matters more than the tool, though — the alternatives above cover the same movement with whatever you have available.
Track your sets, reps and progress on the Smith Rear Lunge (Version 2) — free, with every exercise in the library.