You must be conditioned for whatever activity you're doing if you're going to do it to the best of your ability. There are different types of conditioning for different professions. A deep-sea diver has different conditioning requirements from a sales person. A surgeon has different physical conditioning requirements from a food server. You must add to physical conditioning mental and moral conditioning. You must identify your conditioning requirements and then attain them. Without proper conditioning in all areas, you will fall short of your potential. Rest, exercise and diet must be considered. Moderation must be practiced. It is impossible to attain and maintain desirable physical condition without first achieving mental and moral condition.