Measure your track and field progress precisely: video analysis, jump tests (CMJ, RSI) and a force-velocity profile tell you more than the stopwatch.
As an advanced athlete, the stopwatch alone is no longer enough — it tells you THAT you were slower or faster, but not WHY. Precise progress needs several measurement layers: video analysis for technique, jump tests for reactive strength and a force-velocity profile for your limiting factor. Only this combination makes progress steerable instead of random.
The good news: you don't need a sports lab for it. A phone, a few simple tests and a log are enough to make your development visible and trainable. This guide shows you the four measurement layers that actually tell you something — and how to turn "I think I'm faster" into a solid trend.
Film yourself from the side in slow motion and check concrete, recurring points: where does your foot land relative to the hip? How long is your ground contact? A strike in front of the centre of mass creates a braking impulse that costs speed — and relative propulsive impulse explains around 57% of sprint speed. Video shows you exactly the variables the stopwatch conceals.
The countermovement jump (CMJ) and the Reactive Strength Index (RSI, from a drop jump: jump height divided by ground contact time) make your explosive and reactive strength measurable. Plyometric training clearly improves exactly these values, so they're perfect as progress markers. Test in a standardised way every 4 to 6 weeks and follow the trend, not the single value.
Don't just measure your times over the full distance, but in sections (e.g. 10, 20, 30 m). From a sprint with splits you can derive a force-velocity profile (F0 = maximal force, V0 = maximal velocity, Pmax). That way you see whether force or velocity limits you — and train the bottleneck specifically instead of just "more".
Certain drills are measurable predictors: the B-skip is most strongly linked to sprint performance. Use it as a quick form check between the big tests. But place it correctly — drill models explain only around 20 to 22% of sprint time; they're an indicator, not a replacement for real timing.
A single value lies (mood of the day, wind, warm-up). Only the curve over weeks shows real progress. Enter video findings, jump values, splits and training volume into a log and look at trends. And always test under the same conditions — otherwise you measure noise instead of development.
Maximal sprint and jump tests are highly intense — only test fully warmed up, rested and with full recovery between attempts. Drop jumps (for the RSI) heavily load the tendons; start with low drop heights and a clean landing. Don't pile test days onto tired training weeks. Stop with complaints in tendons or the hamstrings.
Define a fixed "test battery" — e.g. CMJ, 30 m sprint with splits and a side-on sprint video — and run it identically every time, every 4 to 6 weeks, same warm-up, same surface. The signal isn't the single best value but the shift over the weeks. That turns "I think I'm faster" into a solid trend.
With three phone-friendly layers: side-on video analysis for technique (foot strike, ground contact), standardised jump tests like the CMJ for reactive strength and sprint splits over 10/20/30 m for your force-velocity profile. The key is to always test under the same conditions and look at the trend over weeks, not the single value.
The RSI measures your reactive strength — how efficiently you turn a ground contact into jump height. You calculate it from a drop jump as jump height divided by ground contact time. A higher RSI means: more height with a shorter contact. Plyometric training measurably improves exactly this reactive strength, which is why the RSI works well as a progress marker.
It describes whether force or velocity limits you in the sprint. From a sprint with splits you derive F0 (theoretical maximal force), V0 (theoretical maximal velocity) and Pmax (maximal power). If your profile is force-deficient, you train heavy resistance; if it's velocity-deficient, maximal-speed runs. That way you hit your bottleneck on purpose.
Every 4 to 6 weeks is enough for meaningful trends. Testing more often mainly brings noise (mood of the day, wind), less often wastes steering information. More important than frequency is standardisation: same warm-up, same surface, same time of day. And watch the course of several values, not a single outlier.
Leichtathletik: Training Planning