The Spirit Is Willing, But The Body Is Weak

A manager has to take on some sport by his doctor so he decides to play tennis. 

After a couple of weeks his secretary asks him how he's doing. "It's going fine", the manager says, "When I'm on the court and I see the ball speeding towards me my brain immediately says: To the corner! Back hand! To the net! Smash! Go back!"

"Really? What happens then?" the girl asks enthusiastic.

"Then my body says: Who? Me? Don't talk nonsense!"

Watch and pray so that you will not fall into temptation. The spirit is willing, but the body is weak.

Matthew 26:41