<span>How can a person boost the immune system?
</span><span>-Vitamin D, A, C
-Protect your intestine (probiotics)
- A healthy diet, including fermented products and fruits and vegetables
-A healthy lifestyle: a restful sleep, regular exercise, good stress management</span>
Answer:
The Progression Principle states that there is a perfect level of overload in-between a too slow increase and a too rapid increase.
