Patrick Mckillop of Pembroke : Marathon Training Running has continued to increase in popularity among people of all ages who desire to lead a more strong and active lifestyle. Running is one of the most useful exercises a individual can do due to is long-lasting effects on the cardiovascular system and its effects on brain development even amongst adults. However, not enough runners understand the significance of proper training when it comes to running long distances, and especially when it comes to competing in long distance events like marathons and half marathons.