Exercise, especially aerobic, affects the way cells communicate with each other in a positive way. Exploring deeper inside the body and looking closely at our DNA, we are able to see just how important activity is to overall health. At the end of each chromosome, our DNA is protected during replication by what is known as a telomere. It is what holds our DNA strands together and prevents each strand from fraying. A telomere is similar to an aglet on a shoelace which prevents the shoelace from coming apart. As we age these telomeres begin to wear away until the cell no longer is capable of replicating. This is what in turn leads to disease and premature old age. It was previously believed that when this occurs that there is no chance of reversal. According to studies published in the European Heart Journal, Stanford Medicine News Center and Lancet Oncology, all results showed a sizable increase in the proteins responsible for lengthening these telomeres with lifestyle, especially aerobic activity. All evidence points to finding an enjoyable aerobic activity that speeds up your heart rate to the point that you are able to enjoy a good sweat.