GpxFix Blog

How to Combine Multiple Runs Into One Activity

By Roy Lachica on February 03, 2026. Last updated February 4, 2026.

Merging activities is a common need for runners who want to combine multiple recorded segments into one complete workout.

In this guide, we’ll explain why runs sometimes get split, when combining activities makes sense, and how to merge multiple runs into one activity using GpxFix.

Why Runs Sometimes Get Split Unintentionally

Accidentally stopping the sports watch by pressing the wrong buttons
You decide to end the workout but then change your mind and want to continue after stopping the sports watch
Battery running out during a workout
Device freeze, app crashes etc.

Cases where you may want to merge activities that are deliberately split up

For very long trail runs, you recorded multiple segments to save battery life and now want to combine them
You switched recording devices during a run and want to merge the activities into one workout
You record warm-up and main activity as separete workouts but later want to combine them into one activity
You are going to share the GPS route as a public GPX track and need to merge multiple activities (perhaps even from different persons) into one file

Instead of leaving your workout split into multiple entries, you can combine the activities into a single file. Merging runs produces a cleaner training history, more accurate statistics, and a better representation of your effort.

Why Combine Runs Into One Activity?

Merging activities provides several benefits for training analysis and activity tracking.

More Accurate Statistics

When runs are split, your total distance, moving time, and average pace may be fragmented across several activities. Combining them restores the true totals for the workout.

Cleaner Training History

Most runners prefer seeing a single activity for a workout rather than multiple short segments. A combined activity better reflects the actual effort.

Better Map Visualization

When you merge activities, the route appears as one continuous path on the map instead of separate tracks that must be opened individually on Strava or wherever you view your activities.

For long runs, races, or multi-stage workouts, merging activities can give you a much clearer picture of your performance.

How Combining Runs Works

Fitness platforms store activity data as track files, typically in GPX format. A GPX file contains a sequence of GPS points recorded during your activity, along with timestamps, elevation, and other metrics.

Combining runs with GpxFix works by merging the track points from multiple GPX files into a single file. The merged file contains all GPS data in chronological order, creating one continuous activity.

Once the tracks are merged, the fitness platform recalculates statistics based on the combined data.

Step 1: Export the Activities

The first step is to export the runs you want to combine.

Open the first activity in your fitness platform.
Locate the option to export the activity as a GPX file.
Download the GPX file to your computer.
Repeat this process for each activity you want to merge.

After downloading the files, you will have the raw GPS track data for each segment of your run.

Step 2: Upload the GPX Files to GpxFix

Once you have the GPX files, the next step is to upload them to GpxFix.

Upload first any of the files. Then use the Combine-feature to merge another file. Use the Combine button multiple times over if you need to merge more files.

GpxFix will automatically order the files in the correct order based on time stamps in the GPX files so you don't have to keep track of which one to upload first.

Step 3: Verify the merge

After the merge is done you will see an updated stats such as distance, elapsed time, moving time, average HR etc.

The merging process typically performs several steps:

Combines all GPS track points into one file
Preserves timestamps from each activity
Recalculates distance and moving time
Maintains heart rate and elevation data when available

The result is a single GPX file representing the full workout.

Step 4: Download the Combined Activity

Once you are satisfied with the merge, download the new GPX file.

This file now contains the entire run as one continuous activity.

At this stage you may also choose to apply additional fixes such as:

Smoothing GPS tracks
Removing stationary time
Fixing GPS spikes
Correcting heart rate data
Calibrating elevation

Step 5: Upload the Combined Run

The final step is uploading the merged GPX file back to your fitness platform.

In Strava or other fitness platforms, open the activity upload page.
Select the merged GPX file.
Upload the file to create a new activity.

Once uploaded, the platform will process the file and display the full workout as one activity.

In most cases you would want to delete the original split activities after confirming that the merged activity looks correct.

Tips for Avoiding Split Runs

Although combining runs is easy, preventing splits in the first place is even better. Here are some simple tips:

Lock your watch buttons during runs
Disable touch screen on the sports watch if your watch has a touch screen feature
Update firmware on the device to reduce the chance of device freeze and other issues
Ensure your device battery is fully charged
Avoid accidentally pressing the stop button. For example, in the winter having thick gloves near the sports watch can lead to accidental presses.

These small precautions can help keep your workouts recorded as a single continuous activity.

Final Thoughts

Having your run split into multiple activities can be frustrating, but it doesn’t mean your workout data is lost. By using GpxFix you can easily reconstruct the full run.

Combining activities provides cleaner records, more accurate statistics, and a better overview of your training efforts. Whether you accidentally stopped your watch or intentionally recorded multiple segments, merging runs allows you to restore the workout exactly as it happened.

With GpxFix combining activities takes only a minute and helps keep your activity history organized and accurate.