Exercise is always good for you. Walk or cycle rather than driving short distances. Enjoy the exercise you take. When unfit or stiff always have a limbering up and afterwards a winding down routine. Exercise helps you relax and sleep properly and regulates your appetite.
Diet . Eat plenty of fruit and vegetables in your diet. They provide vitamins, minerals and roughage. Overcooking can destroy vitamins. Fresh fruit and seasonal vegetables are especially to be recommended. Try and balance the amount of red meat you consume with fish. And try to eat more unsaturated fats (e.g. vegetable oils and low cholesterol margarine and less saturated fats (butter and lard).
Relaxation . All of us encounter stress most days of our lives. There are always jobs to be done and deadlines to be met. We all however react differently. At time stress makes us tense in the evenings and sleepless at night. The following day we are tired and inefficient and get further behind with our work and relentlessly stress builds up in a vicious circle. We can break this cycle by setting aside 1/2 hour each day where we sit or lie down in a quiet room uninterrupted by the doorbell or phone and switch off. Making a daily habit of this makes us more relaxed and efficient and the effects can be felt throughout the day and night giving us more restful sleep.
Drinking is harmful in excess. It is also dangerous to drive however little alcohol you have consumed. Alcohol in moderation (1 pint of beer or 2 small glasses of wine a day) is not harmful though it is advised to have at least 2 alcohol-free days a week.
Smoking is never good for you however little you smoke. Quite apart from the well-known effects of heart disease, gangrene, asthma and cancer, it ages the skin, leading to premature wrinkling of the face around the eyes and mouth. Besides that it smells awful in your clothes and hair and can cause impotence.