How do I film my lunges for a form check?

Set your phone at hip height a few meters away, side-on or at a 45 degree angle, keeping your whole body in frame for every rep. Both walking and stationary lunges work with the analyzer.

Can AI compare my left and right leg on lunges?

Yes. The analyzer detects which leg is forward on every rep automatically, then compares average depth between your left-leg and right-leg reps across the set, flagging meaningful gaps between sides.

Should my knee go past my toes on a lunge?

A little forward travel is normal, but the analyzer flags front knees that drift well past the toes at the bottom, since that pattern shifts load into the knee joint rather than the muscles of the leg.

What does the lunge form report include?

Per-rep verdicts on front knee depth, knee tracking past toes and inward, torso lean, hip level, and a set-level comparison of left versus right depth, plus tempo timing for every rep.

AI form check

AI Lunge
form check.

Film a set of lunges, upload it, and the AI scores every rep. It knows which leg is forward on each rep, measures your front knee angle and tracking, and compares your left and right sides across the whole set.

Check my form

Every rep, scored

What the AI checks on your lunge.

Depth: Your front knee angle is measured at the bottom of every rep, flagging lunges that stay above about 120 degrees as too shallow.
Knee past toes: Your front knee is tracked against your toes on each rep, flagging knees that travel too far forward at the bottom.
Knee tracking: The AI watches your front knee against your ankle, catching knees that cave inward during the descent.
Torso lean: Your trunk angle is measured through each rep, flagging forward lean beyond about 35 degrees.
Hip level: Left and right hip heights are compared during each rep, catching hips that drop to one side at the bottom.
Left-right balance: The analyzer detects which leg is forward on every rep and compares average depth between sides across the set.

Common faults

Mistakes it catches.

Shallow lunges: The front knee never bending enough, the most common flag when balance is the limiting factor.
Knee drifting past the toes: The front knee traveling too far forward, which loads the knee joint instead of the legs.
Leaning over the front leg: Torso pitching forward past 35 degrees, usually to compensate for weak glutes or tight hips.
One side lunging shallower: A depth gap between your left and right leg reps, invisible in the mirror but obvious in the report.

How it works

From video to verdict.

Film your set

Record one working set with your whole body and the bar or handles in frame.

Upload the video

Create a free account and upload the video to the lunge form check.

Read your rep-by-rep report

Each rep is scored with specific flags and the cues to fix the biggest issue first.

Questions, answered

Lunge form check, explained.

How do I film my lunges for a form check?: Set your phone at hip height a few meters away, side-on or at a 45 degree angle, keeping your whole body in frame for every rep. Both walking and stationary lunges work with the analyzer.
Can AI compare my left and right leg on lunges?: Yes. The analyzer detects which leg is forward on every rep automatically, then compares average depth between your left-leg and right-leg reps across the set, flagging meaningful gaps between sides.
Should my knee go past my toes on a lunge?: A little forward travel is normal, but the analyzer flags front knees that drift well past the toes at the bottom, since that pattern shifts load into the knee joint rather than the muscles of the leg.
What does the lunge form report include?: Per-rep verdicts on front knee depth, knee tracking past toes and inward, torso lean, hip level, and a set-level comparison of left versus right depth, plus tempo timing for every rep.

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