OSX Mountain Lion has been released the other day, which unfortunately disables support for iCal running scripts. Therefore if you have Mountain Lion and iKeepActive or iKeepActive Lite it will open the script instead of running it when your exercises are due. Please click the run button in the Applescript editor when it pops up.
The application works otherwise, but his small piece of the application is key in bringing everything together seamlessly. In light of this, iKeepActive and iKeepActive Lite has been voluntarily pulled out of the Mac App Store until a proper re-implementation of activities tracking is made, possibly with the new notifications system.
Thanks Apple, for changing your technology yet again, forcing developers to re-think or re-write the way their applications work.