Mutabah amal is just like a checklist whether we do it or not. It's usable on Ramadhan. For example, you can khatam Al-Quran in just one month as you read it one juz' a day. You can also 'bertasbih' and many more. Try it and see whether it's good or not. Actually I know this from Hlovate's book - Contengan Jalanan. That's all. Tq, bye. Wassalam.