Peak Hand Speed — FAQ
What does Peak Hand Speed measure?
Peak Hand Speed is the fastest your hands move at any point during the downswing — from the top of your backswing to just before impact. Your Apple Watch's motion sensors capture your wrist movement 100–200 times per second, and MotionEdge uses that data to compute your hand speed in real time, entirely on-Watch.
How accurate is it?
The algorithm is built on published biomechanics research — specifically a peer-reviewed study that validated wrist-mounted sensor measurements against optical motion capture (the gold standard used in professional sports labs). We apply the same signal processing approach: sensor data is rotated into a stable reference frame, filtered using a Butterworth low-pass filter to remove noise, and then integrated to produce speed.
Because the Watch sits on your wrist — not at the center of your hand — there will always be some difference between the number MotionEdge shows and what a lab-grade motion capture system would report. Single-integration of accelerometer data also accumulates small amounts of error over the duration of the swing.
The result is useful for relative comparison within a session — not as an absolute benchmark. If your hand speed goes from 18 m/s to 20 m/s over a month of practice, that's a real improvement. If you compare your number to a friend's Watch reading or a reference from the internet, the comparison is less meaningful due to differences in Watch fit, grip, and sensor calibration.
Why isn't Peak Hand Speed displayed as a prominent metric?
For the same reason we don't estimate clubhead speed from it: an approximate absolute number can mislead more than it helps. Displaying "21.3 m/s" implies a precision the sensor can't reliably deliver as an absolute measurement.
The metric is computed and stored for every swing. It is most useful as a relative baseline — watching your own number trend over time, or comparing swings within the same session. We surface it through the Tempo and AI coaching context rather than as a standalone leaderboard metric.
Why don't you show clubhead speed?
Some apps multiply hand speed by a fixed number to estimate clubhead speed. We don't, because that multiplier isn't fixed — it depends on your shaft length, your wrist-to-club angle at the moment of peak speed, and how much lag you've released. A wedge and a driver have completely different hand-to-clubhead speed ratios.
Rather than show you a number that looks precise but isn't, we show what the sensor actually measures. If you want clubhead speed, a launch monitor (TrackMan, Garmin R10, etc.) is the right tool. MotionEdge can import that data and show it alongside session data so you can see both.
When should my hands be fastest?
This is where hand speed gets really interesting — and where it connects to how well you're releasing the club.
In an efficient swing, your hands should reach peak speed around hip height on the downswing (roughly what instructors call "Position 6" or P6). After that, your hands actually slow down into impact. That deceleration is what allows angular momentum to transfer from your arms into the club — the same physics as cracking a whip. Your hand stops, and the club tip accelerates.
Tour pros' hands typically slow down 15–20% from their peak speed to impact. That deceleration is not a loss of power — it means energy transferred into the club exactly when it needed to.
If your hand speed peaks at impact instead of before it, the club never got that slingshot effect. High-FPS video (120 or 240 FPS) is the most reliable way to see whether this is happening in your swing.
What's a rough reference range for Peak Hand Speed?
These ranges are approximate and vary by sensor fit, grip, and swing style:
| Level | Hand Speed (m/s) | Hand Speed (mph) |
|---|---|---|
| Beginner / short game | 5–10 | 11–22 |
| Average amateur (7-iron) | 10–15 | 22–34 |
| Good amateur (driver) | 15–22 | 34–49 |
| Competitive / low handicap | 20–28 | 45–63 |
More important than the absolute number: Is your swing-to-swing number consistent within a session? Large variation (e.g., bouncing between 14 and 22 m/s) often indicates timing inconsistency that shows up as shot dispersion on the course.
Does it work with all clubs?
Yes. The Watch measures wrist motion regardless of what club you're holding. Speed will naturally be higher with longer clubs and lower with shorter ones, but the measurement is valid for any full swing. For very short swings (chips, pitches, putts), the signals are weaker and hand speed is less meaningful.
How does this relate to Tempo?
A consistent tempo produces more consistent hand speed. If your tempo ratio is erratic, your hand speed tends to be erratic too. The two metrics reinforce each other — tempo measures the rhythm of your swing, hand speed measures the power. Getting tempo consistent is usually the first step toward getting hand speed consistent.