Natural energy must not be mistaken for either gift or anointed service.
The Servants of the Living God are those who are motivated by God's Word and a vision that results from the private prayer life. Their energy for service comes from knowing and loving Him.
Soldier of The Cross, there are many faithful ones who simply put one foot in front of the other and move on.
It isn't the speed or the bounce that matters.
It is the heart that is fixed on Him.