See Anuska, basically immunity is defined as having adequate biological defenses against disease or other potentially damaging foreign bodies. This defense system identifies and attacks viruses, bacteria and parasites, while distinguishing them from our own healthy tissues of the body. Today's is the time, when corona virus has spread globally, we need to boost our immunity. We need to understand and take care of the following simple things to improve our immunity in an easy way:
Simple & Easy Things to boost our Immunity
1. Diet

Before we understand the role of diet in improving our immunity, we should learn a little technicality of immunity. Technically, there is a system of immunity, wherein T helper cells recognize foreign intruders. These cells activates phagocytes and antibodies (immunoglobins) which are used to kill the virus, bacteria and parasites. Could you imagine that these are produced in bulks of bulk to fight out the infections. How will they be created - where is the raw material. What is their raw materials. Obviously proteins, vitamins and minerals. Where can we meet this demand? Obviously from food. So, how should our food be ? It requires not much understanding to know that good quality food is responsible for our good immunity. Yes, but it needs to mention here that for abundance of raw materials - we should include a bowl of sprouts every day, a bowl of 2-3 mix fruits (in morning) and a bowl of 2-3 raw vegetables prior to lunch and dinner. I do not mention about carbohydrates and fats as they are already taken in by us in every meal.
2. Exercise
Before we understand how immunity is based on gentle movements of our body, let's know about lymph, an important channel of our body like blood. Lymph is the fluid that flows through the lymphatic system in our body, (just like circulatory system), a system composed of lymph vessels and intervening lymph nodes whose function is to return fluid from the tissues to the central circulation. Surprisingly, it does not have any pump like heart in the circulatory system. You know what the lymph does? Lymph contain infection-fighting white blood cells, throughout the body. These cells attack bacteria in the blood. But as mentioned earlier, this system does not have any pump. How would this have regular movement? If it does not have regular movement, how can we have better defense? So, only the physical exercise can help the lymph move forward and circulate throughout the body.
In this way, we can see that diet and exercise can improve your immunity. Only 2 things we need to focus on.
3. Relaxation & Meditation

I have studied that immunity improves with the relaxation. It is directly proportional. That means if we are panicful, anxious or stress, our immunity is reduced. The more we are stressed, the more immunity system is compromised and weakened. Hence, relaxation is absolutely necessary to boost our immunity.
So, alongwith diet and exercise, we can also add progressive muscular relaxation or yoga nidra in our lifestyle to have good immunity. Imagery with guided instructions also help us build our immunity.