Generally, if you delete the app and reinstall, most crashing issues are resolved. You will not be charged again if you use the same iTunes Account to download Runtastic and all of your data will be synced, so you wont lose any data.
Note: Please upload all sessions to Runtastic.com from the History tab of the Runtastic App beforehand
Our developers would really appreciate your log files so they can fix certain bugs as soon as possible.
1. Open you iPhone's general settings (on the iOS settings app).
2. Navigate to General > About > Diagnostics & Usage
3. Select Diagnostic and Usage Data
4. Search for any log that says heartrate or heartratePRO
5. Select all content in the log and copy it.
6. Paste the content into a ticket request and choose “Log Files”