Currently you can only synchronize body measurements that you can also see on the site in the graphs.In new version 1.8 all of your data will be synchronized between your application and gymapp.org. There will be all functions available on the site in smart way. For example, if today, you want to make changes to the your training routine through the site, then tomorrow came into the gym you would see all changes on you device.
The version is in the testing phase. But due to the fact that updates are critical, it needs lot of time to test it carefully.
During several weeks will be release version 1.8, if new bugs are no longer be found.