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Guides for fixing and exploring lap data in .fit files.

• Garmin Connect has no lap editor – here's what to do instead

  Garmin Connect shows your lap table but won't let you change it. Here's how to fix accidental, late, or autolap splits without touching anything else in your file.

• Fix an accidental lap press on Garmin

  Bumped the lap button mid-effort? A phantom split turns one clean rep into two ragged halves. Here's how to merge it away in two minutes.

• Fix interval and track-workout laps on Garmin

  Structured workouts that deviated from the plan, or late presses at the end of each rep – fix the boundaries so your splits match what you actually ran.

• Reslice your Garmin run any way you want

  Your watch auto-lapped every kilometre, but you want 5 km blocks, climb segments, or race sections. Load the file, place your own boundaries, download the result.

• Fix Stryd power and lap splits

  ButterLaps recalculates Stryd's per-lap power and distance fields for the new boundaries rather than clearing them – the one tool that gets this right.

• Edit Apple Watch workout laps

  Apple Fitness has no lap editor. Export your workout as a .fit via HealthFit or WorkOutDoors, drop it into ButterLaps, and fix the splits on your phone.