Guide
How to track sprint times to the tenth of a second
In marble, a sprint exercise holds plans with a distance, a rep count and a target time. Time each rep with the built-in stopwatch or type it in, for example 14.8, and marble marks every rep as hit or missed and keeps your fastest time for each distance.
Set up a sprint plan
- Open the Exercise Library. Tap Manage in the exercise picker, or go to Settings, then Data & Backups, then Exercise Library. Add or edit an exercise.
- Choose the Sprint tracking type. Every rep then needs a distance and a time.
- Add a plan. Set the distance (for example 100 m), the number of reps (1 to 50), and either one target time (“14.5 s or faster”) or a range such as 19–21.5 s. Decimal seconds are fine.
- Add more plans if you need them. One exercise can hold several, such as a 60 m speed plan and a 150 m tempo plan.
- Set the default recovery between reps, then save.
Log a session
- Tap Add Set on the sprint exercise. marble picks your most recent plan, locks the distance and starts at Rep 1 of 4. Use the Plan menu to switch plans.
- Start the stopwatch before the rep and stop it after, or type the time, such as
14.8. Add RPE and rest if you like. - Save. marble checks the time against the target, and the rest timer starts before the next rep.
- On the last rep, tap Save Final Rep. You’ll see how many reps hit the target, your best and average times, and the result for every rep.
Reading your results
- Hit, missed or not scored. Each rep in Log shows its time and target with a check or a cross. A rep with no time, or run at a different distance, is left unscored. The result is always written out, never shown by colour alone.
- Fastest times. A rep that beats every earlier time for the same exercise and distance gets a Fastest badge.
- Trends. In Progress, open Details to chart your best times at your most-logged distance, along with a weekly goal hit rate.
- A nudge to go faster. Hit the target on at least 80% of scored reps in each of your last two sessions, and marble suggests a target 0.2 s faster.
Every rep also stays a normal entry in your journal, so your sprints sit next to your lifting.
Writing sprints as text
In the Add tab, Sprints 4x20m becomes four 20 m reps, and 4x20meter accelerations at 85-90% becomes four 20 m accelerations. The percentage is ignored, not read as a weight. Times from a typed line are added during review.
Limits worth knowing
- Times are stored to the tenth of a second, not the hundredth.
- The stopwatch is a hand-operated timer on the phone. marble doesn’t connect to timing gates or other sensors.
- There is no Apple Watch app. If you record runs on a watch, the workout summary can come in through Apple Health, but the rep-by-rep sprint times are logged in marble.
