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Pump, carve, flow, measured from a fixed phone, with one thing to work on per clip. Surf training that sticks between sessions. Compression and stance are side-on reads; film that angle another day.
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What the coach measures
One clip, one angle. Here's what each angle can read. Film the other angle another day for the rest.
Estimated cycle rate from the median interval between detected compressions. Intervals above 2.5 seconds are excluded. This does not measure speed or power, or establish a target cadence.
Regularity of retained intervals between detected compressions, from 0 to 1. Requires at least six intervals; gaps above 2.5 seconds are excluded. This does not establish speed, efficiency or improvement.
Time from landing on the board to your first real pump cycle. The mount is a beat in the music, not a pause - the best riders resume rhythm within a second.
Typical horizontal range of the midpoint between your wrists relative to your shoulders during the run, in torso lengths. Opposite hand movements can cancel. This does not measure each arm's swing or the power transferred to the board.
Similarity between changes in projected shoulder and hip widths, allowing up to 0.6 seconds of offset. The 0–1 value includes opposite patterns. It does not judge coordination, measure power transfer or identify which body part starts a turn.
Typical change in the signed horizontal distance between your shoulders during the run, divided by torso length. Camera angle affects this projected width. It does not measure a rotation angle, carve depth or commitment.
Estimated cycle rate from the median interval between detected compressions. Intervals above 2.5 seconds are excluded. This does not measure speed or power, or establish a target cadence.
Regularity of retained intervals between detected compressions, from 0 to 1. Requires at least six intervals; gaps above 2.5 seconds are excluded. This does not establish speed, efficiency or improvement.
Time from landing on the board to your first real pump cycle. The mount is a beat in the music, not a pause - the best riders resume rhythm within a second.
Typical horizontal range of the midpoint between your wrists relative to your shoulders during the run, in torso lengths. Opposite hand movements can cancel. This does not measure each arm's swing or the power transferred to the board.
How far your hips travel vertically through each pump cycle, in torso-lengths - the compression-extension engine, read from the side.
How much your knees cycle between compressed and extended across the run. Sink into the turn, drive out of it - rigid legs are the single fastest way to kill a pump.
One down the line clip, the angle we ask for, measures 3 of these 5: Compression and Stance & feet need a Side-on clip.
A category the clip can't show clearly comes back blank rather than guessed.
The report, start to finish
Explore it: this is the layout you get. The numbers below are a worked example, not a recording of someone's clip.
Practice you can choose
On flat ground, explore an easy curve and finish with the foot brake you already control. Keep slopes, jumps and slides out of this practice.
At low speed, practice stopping on purpose: step off into a run, roll onto grass, or carve to slow down.
Get rolling with one gentle push, then wiggle your heels and toes to keep the board moving.
How to film it
- ✓ Film landscape with the phone resting on a tripod, bench or ledge, with a visible, steady background. If we can't verify camera movement, pump events and measurements are unavailable. You should stand about a fifth of the frame tall, head to wheels; below a tenth the clip is usually rejected
- ✓ Whole body in frame the entire run, head to wheels
- ✓ Down-the-line view: pump toward the camera, turn and pump back; each stretch in one direction is read on its own
- ✓ Side-on view: pump a short line past the camera and back, close enough that you stay big in the picture
- ✓ 10-20 seconds of continuous pumping beats a highlight reel
- ✓ Normal frame rate at normal playback speed - no slow-motion export. We read the pump at 30 frames a second, so 60fps adds nothing, and a slowed-down clip reads as a slow pump
Fix your surfskate
- The Arms-Only Pump: Shoulders Whipping, Board Barely Answering
- Circles to Figure-Eights: the Classic Road to Flat-Ground Speed
- Does Surfskating Improve Your Surfing? Only If You Ride It Like a Wave
- Heel-Toe Wiggles: the Two-Minute Warm-Up Your Pump Is Built On
- How Fast Should You Pump a Surfskate? About Once a Second
- How to Film Your Surfskate Runs: Two Angles That Tell the Truth
- How to Pump a Surfskate: the Whole Chain, One Layer at a Time
- The Layer-Up Pump: Rebuild Your Chain One Segment at a Time
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