Exercise plays a crucial role in human physiology in general, and therefore in human health. Research shows that specific types of moderate exercise have a positive effect on immunity, but that excessive amounts of intense exercise act as a stress, causing temporary immunodeficiency which can result in sickness.
To some extent, what is "excessive" depends on what condition your body is in. If you do not exercise regularly, then a moderate amount could be excessive for your untrained body.
The solution for sedentary individuals is not to avoid exercise but to start a program that begins with mild exercise and gradually increases to a moderate level consistent with your body's progress in adapting to the training.
Regular consistent exercise of specific types, to be listed below and discussed further, is part of a healthy lifestyle that can keep your immune system and the rest of you healthy.
Your exercise program should be customized for you, using indicators such as your heart rate and VO2 max.
The general rule is that frequent moderate exercise is beneficial, while infrequent extreme exercise is detrimental.
Although extreme exercise for prolonged periods should be avoided, if you do exercise too much, compensate by giving your body a rest to repair the damage. In other words, although frequent exercise is recommended as a general rule when the level of exercise is moderate, a longer rest break is strongly recommended if exercise is overdone.
Five types of exercise should be done daily, starting at low intensity and building to the optimal level, which is moderation for an athletically trained body, when you reach that level:
These are the five categories:
1. Bouncing-- bouncing, trampoline, jumping rope
2. Cardio -- walking, running, bicylcing, swimming, cross-country skiing, aerobics
3. Massage -- Swedish or any non-injurious massage (various types)
4. Weight Training --many slow repetitions using light weights are recommended
5. Yoga --specific exercises to stretch muscles, flex the spine, move internal organs