Jack LaLanne

Focus on your problem zones, your strength, your energy, your flexibility and all the rest. Maybe your chest is flabby or your hips or waist need toning. Also, you should change your program every thirty days. That's the key.

To ask questions can become the laziest and wobbliest occupation of a mind, but when you must yourself answer the problem that you have posed, you will meditate your question with care and frame it with precision.