not quite ... i believe aerobics, and raising the core body temperature, destroys virus in the body and supercharges the immune system. so i don't care if i "catch" something, because that is inevitable. always have, always will. the body is designed to deal with that if it is well cared for.this is possible. i think nearly everyone has a slightly different definition of many things. does yours involve "not catching the flu" like mine? because what you don't catch probably won't hurt you...