The brain's preferred source of fuel is glucose/carbohydrates. And when you go on a low-carb/high-protein diet, your brain is using low-octane fuel. You'll be a little groggy, a little grumpy.
Jack LaLanneYou should do it against the clock. Say you are going to do 30 laps in 15 minutes. Then you try to do it each day a little faster. That is putting demands on the body, and that is how you build up. You keep up your energy instead of going downhill.
Jack LaLanneEverything you do in life, I don't care, good or bad - don't blame God, don't blame the devil, don't blame me, blame you. You control everything! The thoughts you think, the words you utter, the foods you eat, the exercise you do. Everything is controlled by you.
Jack LaLanne