Assess New Fueling Products

It's likely that you will try a fueling product that doesn't agree with your body while experimenting with different fueling options to see what works best for you during exercise.

For example, athletes with sensitive stomachs may prefer to avoid solid products like energy bars because they typically increase the feeling of fullness in the stomach. Other fuel options may not be properly received by your body for no obvious cause. For your long runs, consider maintaining a log in which you record your choice of fuel, how much you consume, and any stomach cramps or other symptoms you experienced. By doing so, you can eliminate particular foods and beverages that upset your stomach.