Advocates of the early start say it makes them more alert and energetic during the day. If you exercise in the morning, wait a half hour after getting out of bed and, in addition, spend more time in warm-up activity. Among the factors you should consider in developing your workout schedule are personal preferences, your plans for the day, availability of exercise facilities, and weather. You should not exercise strenuously during extremely hot, humid weather or within two hours after eating. As a general rule, you should wear lighter clothes than temperatures might indicate.
Exercise generates great amounts of body heat.
Light-colored clothing that reflects the sun's rays is cooler in the summer, and dark clothes are warmer in the winter. When the weather is very cold, it's better to wear several layers of light clothing than one or two heavy layers. The extra layers help trap heat, and it's easier to shed one of them if you become too warm. In cold weather, and in hot, sunny weather, it's a good idea to wear something on your head. Wool ski caps are recommended for winter wear, and some form of tennis or summer hat that provides shade and can be soaked in water is good for summer.