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L-sit: spot and fix your mistakes
In the L-sit, SkillTrack checks whether you lean back. That happens when the hip flexors don’t hold the upper body upright and the back tips backward to keep the legs up. SkillTrack is a web app that analyzes your phone video on your device and tells you whether that is the case for you.
How do I spot a mistake in my L-sit?
A video of yourself shows whether your upper body stays vertical:
- You lean back: the upper body tips backward to keep the legs up.
- SkillTrack also checks for straight elbows.
Why do I lean back in my L-sit?
Your hip flexors don’t hold the upper body upright. So the back tips backward to keep the legs up.
Tip: Sit on the floor with straight legs and consciously bring your upper body vertical.
These exercises help against leaning back
- Sit upright with straight legs: Feel the vertical upper body while sitting, before you hold it in the L-Sit. The chest stays up, you don’t lean back behind your hips.
- Tuck L-Sit with upright torso: Hold the legs up without tipping backward. The shoulders stay over the hands, you don’t lean back.
- Seated leg raise on the floor: Strengthen the hip flexors that keep the upper body upright. The upper body stays vertical, even if the leg only comes up a little.
How does SkillTrack check my L-sit?
You film yourself with your phone or pick an existing video. The analysis runs on your device: the video and the body points do not leave it.
SkillTrack recognizes the angle you filmed from and checks only the mistakes that can be measured from that angle. If the angle does not fit, the app rejects the recording instead of judging it wrongly.
You get the finding in one sentence, the reason behind it, and matching exercises.
What comes next?
In SkillTrack the L-sit is a single skill without stages. Building it means first practicing the upright upper body while sitting, then the tuck L-sit, and strengthening the hip flexors.
What does SkillTrack cost, and what can it not do?
- Free: one skill of your choice with three analyses.
- After that, currently a one-time payment of €9.99 (founder price), no subscription. Then you can check as often as you like, for every skill.
- SkillTrack does not replace a coach and is not a medical product.
- You need a phone with a camera or an already filmed video. On first start the app downloads the recognition model once.
Frequently asked questions
Is there an app that analyzes my L-sit from a video?
Yes. SkillTrack analyzes a phone video of your L-sit, names the mistake, the reason behind it, and matching exercises. The analysis runs on your device.
Is my video uploaded?
No. The video and the calculated body points do not leave your device. The only exception is if you yourself send a recording to the provider for troubleshooting.
Which L-sit mistake does SkillTrack detect?
Leaning the upper body back. SkillTrack also checks for straight elbows.
Why do I lean back in the L-sit?
The hip flexors don’t hold the upper body upright, so the back tips backward to keep the legs up. Sitting upright with straight legs, the tuck L-sit with an upright torso, and seated leg raises help.
What does SkillTrack cost?
One skill of your choice with three analyses is free. After that, SkillTrack currently costs €9.99 once, with no subscription.
Does SkillTrack replace a coach?
No. SkillTrack shows you which mistake is in your video and lists exercises for it. It is not a medical product.
Last updated: 10.10.2026