Coaching notes
Serve mechanics, in numbers
No listicles, no gear reviews. Just the specific things a camera can measure about a serve, what they mean, and what to do about them.
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Your serve doesn't lack strength. It lacks tilt.
Shoulder-line tilt is the checkpoint most club serves fail, and it is invisible from inside the motion. What it is, why a flat shoulder line caps your speed, and the three drills that change it.
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How to film your tennis serve so an app can actually read it
Camera height, angle, distance, frame rate and light — the five things that decide whether a serve analysis is measured or guessed. Two minutes of setup, better data forever.
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What counts as a good serve score?
Why a 71 is a genuinely good club serve, what the number is graded against, and why chasing the total instead of the shape is the fastest way to waste a season.
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On iPhone
Measure yours.
iPhone · iOS 17 or later · free to install · three analyses a month free