There are many reasons to get in shape. Weight loss is a prime motivator, as is reversing a negative health effect, such as high cholesterol or increased diabetes risk. Routine exercise also can improve life expectancy. WebMD says exercise keeps the body and brain healthy. That’s why exercise should be an important component of daily life no matter one’s age. Research published in the journal Immune Aging found that how people age is 75% lifestyle and only 25% genetics, which underscores the importance of the lifestyle choices people make. Cardiorespiratory fitness Many health experts say that cardiorespiratory fitness may be just as valuable a metric to determine overall health as blood pressure and lipid levels. People with a high aerobic capacity can deliver oxygen to tissues and cells efficiently to fuel exercise, according to data published in 2014 in the journal Aging & Disease. In a study involving 11,335 women, researche...