Best Yoga App for Increasing Immunity at Home. Why you must use Immunity Boost Food, Yoga & Exercise at Home? 1. You easily & frequently caught fever, viral infection or bacterial infection. 2. You have very weak immunity and usually suffer with cough and cold during season change. 3. You want to build natural immunity strong without medicine at home. 4. You need virtual personal immunity therapy coach at home to train you step by step by 3D video for Free. After lot of research & development