This is 21-time Olympic gold medalist Michael Phelps. During his training season Phelps actually spends more hours each day in water than out of it. He sticks to an amazingly strict diet and workout regimen. He is pictured above doing underwater kicking drills. In speaking about his discipline he says, "It's painful, but very effective."
Do you want to be rewarded by God? Immerse yourself in the Word. Train yourself in godliness. The training may be difficult, but the reward is worth the pain.