It is okay as it stands. Adding user defined activities is quite screwy. Somehow it assumes that each new category will map to only one existing category. So if you define Running as a Sport and then want to add Swimming also as a Sport, it wont let you. That is quite daft as the app cost me about $4. Still ok for tracking where your time goes if you can live with the existing categories.
UttamKumar about aTimeLogger Time Tracker, v1.8.0