I would focus on running long distances because the body will use fat as a main energy source and spare the use of muscle glycogen and blood glucose so that it is available for use if exercise intensity increases and oxygen availability is decreased. I would implement long jogs for long distances or any low intensity, high duration cardio to train for a marathon. The reasoning behind the activities that I have chosen is because staying at a low intensity, will use mostly fat for energy. This will give me the energy for the long duration. Although I may be burning mostly fat, a steady supply of carbohydrate is still necessary for the breakdown of fat into an energy
I would focus on running long distances because the body will use fat as a main energy source and spare the use of muscle glycogen and blood glucose so that it is available for use if exercise intensity increases and oxygen availability is decreased. I would implement long jogs for long distances or any low intensity, high duration cardio to train for a marathon. The reasoning behind the activities that I have chosen is because staying at a low intensity, will use mostly fat for energy. This will give me the energy for the long duration. Although I may be burning mostly fat, a steady supply of carbohydrate is still necessary for the breakdown of fat into an energy