The most simplistic actions are often the most difficult behaviors. Falling backwards takes little more than gravity. However, we don't want to fall backwards (ie - see "trust fall"). Praying doesn't take any special language or place to do it but it is done much less often than it should. Waiting doesn't require any energy but being patient and standing still is painful for most. Stay. Wait. Patience. Trust.
Lord, please give me the strength to do the more difficult behaviors that don't take much effort, other than choice.