A sprint profile models how an athlete accelerates. You time the athlete at set distances along a sprint (say 10, 20, 30, and 40 yards into a 40-yard dash), and FYTT fits a velocity curve to those splits and calculates 12 force, velocity, and power metrics from it. This guide covers creating a profile, recording splits, what the outputs mean, and where to find them.
Plan availability
Sprint profiles are a paid feature. On a plan without it, Sprint profile still appears under Add metric, but the panel shows Upgrade to Access and View Plans instead of the form.
Creating a sprint profile
Sprint profiles are created alongside your other metrics. On the Metrics tab, click Add metric, then choose Sprint profile (1).
In New sprint profile:
Enter a Name (1), such as "40yd dash" or "90ft sprint".
Pick the Distance unit: Meters, Yards, or Feet. Every interval uses it.
Pick a preset (2): 40-yard dash, 30 m, 90 ft sprint, or Blank. A preset sets the intervals and, except for Blank, the unit.
Adjust the intervals (3). Each is a distance from the start where you'll record a time. Type a distance into Add and press Enter to add one, or click a chip's × to remove it.
Under Settings, choose the unit velocity is calculated in (4), then the distance and the time from the start at which FYTT calculates instantaneous horizontal velocity and momentum. Both take whole numbers.
Click Save profile. The profile's data page opens so you can record results.
Outputs lists the 12 metrics the profile will calculate.
Defining intervals
Put an interval at every point your timing gates or stopwatch split the run. The curve is fitted to these times, so several intervals, including some early in the run, describe acceleration more closely than one or two.
Sprint settings
After you save, only the name can change. Click the profile's name on the Metrics tab to open Edit sprint profile: it shows the intervals and settings but doesn't let you edit them, because results already recorded were calculated from them. To change the test, create a new profile. Delete removes the profile and every result recorded against it, across the organization.
Recording splits
Click View data beside the profile on the Metrics tab to open its data page. The Info panel on the left lists the profile's velocity Unit, its Instantaneous calculations, and its Intervals. The grid has a row per athlete and these columns:
Height and Weight, the built-in metrics.
One time column per interval, named for its distance, such as T @ 10yd. Enter seconds.
Temp (°C), the air temperature in degrees Celsius.
mmHg, the barometric pressure in millimeters of mercury.
The 12 outputs, which are read-only.
Values are recorded on the as of date in the toolbar (1), which reads Today until you pick another date, just like the Data tab in the metrics guide. Set it to the test day before you type. Each value you enter for an athlete recalculates that athlete's profile for the date, and the outputs fill in shortly after.
Why no outputs were calculated
FYTT calculates only when the athlete has a time for every interval, a temperature, a pressure, a height, and a weight, all above zero. If one is missing, the outputs stay blank and nothing is flagged. A missing time, temperature, or pressure falls back to the athlete's most recent earlier value, and height and weight come from their most recent measurement. If you add height or weight after entering splits, type one of that day's splits again to recalculate.
Importing splits
To load a testing day from a spreadsheet, use data import with one column per grid column, named exactly as the grid names it (T @ 10yd, Temp (°C), mmHg). Imported values recalculate profiles the same way typed ones do. The name has to be unique in your organization: every sprint profile has its own Temp (°C) and mmHg columns, so with more than one profile an import can fill the wrong one. Enter those by hand instead.
The 1080 Motion integration brings in 1080's own sprint results, such as top speed, as ordinary metrics. It doesn't record split times, so it can't feed a sprint profile.
What FYTT calculates
FYTT fits a velocity curve to the splits, then works out horizontal force from it, allowing for air resistance (which is why it needs height, weight, temperature, and pressure). Plotting force against velocity gives a straight line, and most of the outputs come from that line:
F0 (theoretical peak horizontal force): the force the athlete could produce at zero speed, in newtons per kilogram of body weight.
V0 (theoretical peak horizontal velocity): the speed at which the athlete could no longer produce horizontal force, in the profile's velocity unit.
Pmax (estimated max power): the peak of the power curve, F0 × V0 ÷ 4, in watts per kilogram.
Force-Velocity slope: how fast force falls as speed rises. A steeper (more negative) slope means a more force-dominant sprinter; a flatter one, a more velocity-dominant one.
Terminal velocity: modeled speed at the last interval.
Attainable peak horizontal velocity: the practical top speed, where the curve's acceleration has all but stopped.
Time to attainable peak horizontal velocity and Distance to attainable peak horizontal velocity: when and how far into the run the athlete reaches it.
Instantaneous horizontal velocity at the distance and at the time set in Settings, such as "@ 10yd" and "@ 2s".
Instantaneous momentum at the same distance and time: that velocity times body mass, in kg m/s.
Every output is saved as a measurement on the test date. The calculations are fixed; to work out something else from a sprint time, record it on a regular metric and use a formula.
Viewing results
Each sprint profile has a Sprint report under the FYTT tab of Reports. It plots one athlete's three most recent profiles on six graphs (Distance / Time, Horizontal Force / Time, Power / Time, Ratio of Force - Velocity, Velocity / Distance, and Velocity / Time), with a tile for each output showing the latest value and its trend across every test. Use the athlete switcher at the top to change athletes.
Assessments (1) in the report's header opens Sprint Profile Assessments: every test date the athlete has, each with its splits and all 12 outputs.
To compare a group rather than one athlete, add a Sprint profile column to a group report; see Reports.