As of August 2019, Runtastic decided to retire their Web site. That means there is no more way to download the GPX files from the Web site, making the program obsolete.
This a Python script used to send sport sessions from Runtastic to Strava.
To run it, export the following variables in your environment and run the script:
export RUNTASTIC_EMAIL="foo@example.com" export RUNTASTIC_PASS="s3cur3" export RUNTASTIC_USERNAME="foo" export STRAVA_ACCESS_TOKEN="22kdwd021k210ncbqdwq"
You can use the get-token.py script to get a Strava access token.
By default it only send activities for the last four days, but you can extend that range if you wish to synchronize older sessions.