Why Flying Sprints Record a Higher Top Speed than Standing Starts

Your best sprinter runs a rolling 30 at 3.6 seconds and everyone in the building agrees she's the fastest kid on the team. Then the same athlete lines up for a standing 40-yard dash at a combine event and finishes mid-pack. A scout glancing only at that second number writes her down as average speed. Both readings are accurate. They're just answering two different questions, and confusing them is one of the most common testing mistakes a speed program can make.

A flying sprint starts the clock on an athlete who is already moving at or near race pace, so the number it produces sits close to true instantaneous top-end velocity. A standing start begins the clock from a dead stop, so a meaningful share of that time gets spent overcoming inertia and climbing toward speed rather than expressing it. One test isolates maximum velocity. The other measures acceleration with a chunk of near-max velocity mixed in at the end, depending on the distance. Knowing which one you're actually looking at changes how you read every sprint number your athletes produce.

The physics behind the gap is straightforward once you see it laid out. From a standing start, ground contact time is long and force output is directed mostly horizontally during the first few steps, because the body is fighting inertia rather than maintaining a velocity it already has. Velocity climbs along a curve that flattens out — asymptotically approaching a ceiling — rather than rising in a straight line, and most athletes below elite sprint level haven't finished flattening that curve even by 30 or 40 meters. Whatever number the clock shows at that mark is still partly an acceleration number.

A flying sprint sidesteps the climbing part of that curve entirely. The athlete builds up speed over an unmeasured run-in zone — typically 20 to 30 meters — before crossing the first timing gate already near top speed. The clock then only measures a short zone, commonly 10 or 20 meters, during which velocity is close to flat. That's why flying-start times read faster than standing-start times over the same distance, and why the gap between the two isn't a testing error — it's the entire acceleration phase, isolated and removed.

Notice that a standing 30m result already contains a flying-style number buried inside it — the last few meters, once the athlete has mostly finished accelerating. The problem is you can't extract that segment from a single stopwatch time at the finish line; you need intermediate splits or a second gate to see it.

Three separate lines of sprint-timing research, spanning two decades, back up what coaches have long suspected from the stopwatch: start type and timing method aren't a minor detail, they materially change what a sprint time represents.

Put together, the three studies describe the same mechanism from three angles: standing starts fold acceleration noise into a top-speed estimate, that noise is measurable and shrinks reliability, and the transition point where true max velocity actually appears often sits further down the track than a short standing test ever reaches.

A flying sprint test is only as good as its run-in. Too short a build-up and the athlete crosses the first gate still accelerating, which just recreates the standing-start problem under a different name.

1. Step 1 — Set the run-in distance to the athlete's level. Youth and recreational athletes typically reach a stable top speed within 15–20m; well-trained team-sport athletes need closer to 20–25m; sprint-trained athletes may need 30m or more. When in doubt, err longer.
2. Step 2 — Place timing gates at hip height, not waist or chest. Gates set too high can miss a shorter athlete's trunk on the trigger and add false variability to the split.
3. Step 3 — Time a 10m or 20m zone, not a single finish-line split. A 10m fly is more sensitive to a true peak; a 20m fly trades a little of that peak sensitivity for a steadier average that's less rattled by one uneven stride.
4. Step 4 — Instruct a consistent build-up effort. Athletes should reach the first gate already at or near full speed, not still ramping up through it — coach the run-in as 'accelerate hard through the first gate,' not 'jog into it.'
5. Step 5 — Run 3 trials with 3–5 minutes rest between them and record the fastest, since the point of the test is to capture a ceiling, not an average.
6. Step 6 — Log wind if outdoors. A trailing wind over roughly 2.0 m/s can inflate a flying-sprint time enough to distort a training-block comparison, the same threshold track and field uses to flag wind-assisted marks.

Keep the standing-start test in the program too — it answers a different question and shouldn't be discarded just because the flying test measures speed more cleanly.

The right test depends on what decision you're actually trying to make, not which one produces the more impressive number.

Use a flying sprint when you need true maximum velocity — tracking whether a max-velocity training block is working, screening for a top-end speed deficit that's capping game speed, or comparing an athlete's ceiling across a season regardless of how quickly they get there.

Use a standing start when the question is about acceleration — most team-sport actions (a soccer press, a first step past a defender, a base-stealing jump) happen inside 5 to 10 meters, well before top speed ever becomes relevant. A standing 10m or 20m time reflects that reality far better than a flying number ever will, because in-game speed almost never gets a 25-meter running start.

Field-sport programs get the most out of running both from the same session: a standing 30m for acceleration, followed by a flying 10m or 20m off a separate run-in for max velocity. Together they separate two athletes who post the same 30m time for entirely different reasons — one who accelerates hard and caps out early, and one who ramps up more slowly but has a higher ceiling once at speed. Coach those two athletes identically and you'll under-develop one of them.

The most common error is graphing standing and flying times on the same chart as if they tracked the same quality across a season. A jump in a flying-10m time and a flat line in a standing-30m time in the same block isn't a contradiction — it usually means acceleration held steady while max velocity improved, which is exactly the kind of signal that gets lost when both numbers sit on one undifferentiated speed trend line.

A second mistake is shortening the run-in to save time on a busy testing day. A 10-meter build-up dressed up as a flying start for an adult athlete who needs 20+ meters to reach top speed just produces a standing-start result with extra steps — and extra false confidence, since it's labeled as a max-velocity number when it isn't one.

A third mistake is inconsistent build-up effort between trials — one rep built up gradually, the next sprinted hard from the first step. That variability in how the athlete arrives at the gate adds noise that looks like day-to-day fitness change but is really just pacing inconsistency in the unmeasured zone.

1. Haugen, T.A., Tønnessen, E., & Seiler, S.K. (2012). The difference is in the start: Impact of timing and start procedure on sprint running performance. Journal of Strength and Conditioning Research, 26(2), 473–479.
2. Duthie, G.M., Pyne, D.B., Ross, A.A., Livingstone, S.G., & Hooper, S.L. (2006). The reliability of ten-metre sprint time using different starting techniques. Journal of Strength and Conditioning Research, 20(2), 246–251.
3. Nagahara, R., Matsubayashi, T., Matsuo, A., & Zushi, K. (2014). Kinematics of transition during human accelerated sprinting. Biology Open, 3(8), 689–699.