-m/s
The fastest the weapon hand moves. This is the speed the opponent has to react to.
0 m · en garde
AI fencing analysis from one camera.
Red Piste uses AI body tracking to measure your fencing, starting with the lunge. It follows your hand and hip through every lunge, measures the speed in real units, and shows how you improve session by session.
Runs offline on a laptop. Made by a fencer, for fencers.
In development. Sign up to hear when it is ready.
Example data
2 m · what it measures
Four numbers per lunge
Each lunge is found automatically. You get its peak speeds, how long it took and how far you travelled, in real meters.
Hand peak
Hip peak
-m/s
How hard the body drives off the back leg. A quick hand with a slow hip is only an arm.
Time
-s
From the first movement to the end of the extension.
Distance
-m
How far the hand travels, so you can compare lunges of different length fairly.
How it is measured: a depth camera finds the wrist and hip in every picture, about 30 times a second, and knows how far away you are, so it can turn pixels into meters. Speed is the distance moved between pictures divided by the time between them. Tracking glitches are filtered out and counted, so a jumpy reading does not become a fake record.
4 m · frame by frame
Watch it back, one frame at a time
Every lunge is saved with its pictures. Drag the slider, or hold a frame button to creep through it, and see the speed at that exact moment.
Replay Example
Hand 0.0 m/sHip 0.0 m/sDrag the graph, the picture or the slider
FRAME 1 OF 1
6 m · progress
See yourself get faster
Lunges are grouped into sessions of five. Each fencer has their own history, so the chart is about you, not the club average.
+0.6m/s hand speed since session 1
Example data
Example data
Hand averageHip averageSession best
8 m · coaching
You against the ideal
Stand side-on and the trainer draws an ideal lunge sized to your body next to you. Every check is scored and the weakest come first, so you know what to fix.
YouHand 6 cm low
Ideal Example
9 m · the data
Learning from real fencers
There is no single right on guard. A tall sabre fencer and a short foil fencer stand differently. Red Piste is learning what good fencing looks like for each body, from recordings of real fencers.
The ideal on guard, sized to you
We record fencers side-on, and coaches rate each take. The well-rated takes, and those of top fencers, are averaged for each weapon, for men and for women. As the recordings grow, a formula matches the knees, the stance and the arm to height and to leg and arm length, so the guide will be built for your size. It will show what good fencers of your build tend to do. It isn't a substitute for your coach.
A webcam that learns from a depth camera
In our recording sessions a depth camera and a laptop webcam watch the same fencer at the same moment. The depth camera measures real 3D angles; the webcam learns to read the same angles from a flat picture. Every session makes the webcam more accurate, so a laptop can be all you need, at home or at a competition.
Help build the ideal. The more fencers we record, the better the guide gets for every build and weapon. If your club would like to take part, we would love to hear from you.
Every recording is a code: no name, no date, no video. Only the positions of the joints are kept, with the fencer's consent (a parent's or guardian's for under-18s).
10 m · what is in the app
One app, starting with the lunge.
Lunge speed
Press start and lunge. Hand and hip speed, time and distance for every lunge, with a replay you can step through.
Trainer
Stand next to an ideal lunge sized to your body and see a score for every check, weakest first.
History
Every session saved per fencer, with a chart of your progress and any lunge a tap away.
Profiles
Each fencer is measured once, or added from their height, and everything is filed under their name.
Getting started: level the camera, stand side-on, and stand still for about 30 seconds while it measures you. After that, you just press start.
Works offlineOne cameraKinect or webcamWindows laptop
About the AI
The tracking is a neural network that finds your joints in each camera picture. The on-guard guide is sized to your height and proportions, and we are building it from recordings of real fencers (see The data, above). It shows what good fencers of your build tend to do. It isn't a substitute for your coach.
11 m · what is coming
What we are building next
Red Piste is growing past the lunge. These are planned, in no fixed order, and they may change as we test with fencers and coaches.
Planned
Coaching tips in words
Coaches tag each lunge with what they saw, and Red Piste turns those tags into a focus for next time. Next, the trainer spots the main fault itself, on guard and in the lunge, and says how to fix it.
Planned
Fleche
The running attack, measured: how far, how fast and how long, with its own reaction test.
Planned
Steps and footwork
Advance and retreat: step length, steps a second and rhythm, and how quickly you react to a signal to change direction.
Planned
Lesson watcher
Follows a live lesson with the coach and the student in the picture, counts and names each action, measures every one, and ends with a lesson summary.
Planned
Smarter pose tracking as data grows
Every fencer we record teaches the tracking what real fencing poses look like, so it follows the body more accurately, especially with a single webcam.
Planned
Ideal form for your weapon
The trainer's guide built from real fencers: the on guard, lunge and fleche for your weapon, gender and size, with the hip and shoulder turn.
Planned
How you compare
See how your speed and stance compare with fencers of your size, weapon and age group, as a guide and not a verdict.
Tell us what you want first. Which of these would you use most? Leave a note when you sign up and it will shape what we build.
12 m · who it is for
For the coach and the fencer
Coaches
- Numbers to point at. Show a fencer their hip lagging their hand, in meters per second.
- One profile per fencer. Bodies are measured once, and every lunge is filed under the right name.
- Progress you can prove. Session averages and bests, over weeks.
Fencers
- Practice alone. No partner or coach needed to know how a lunge went.
- See what to fix first. The weakest check is always at the top.
- Beat your own record. Your best hand and hip speeds are always on screen.
13 m · see it in action
Watch the demo
14 m · the end of the piste
Stay updated
Red Piste is being built and tested now. Leave your details to get news and hear when it is ready, or to ask for a demo.
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