Deciding on the best active nutrition for you is down to how your body responds to exercise and nourishment. A quick rule of thumb is that drink mixes can keep you hydrated and act as a source of calories through carbohydrates; sweets and chews are there for an energy boost and to stabilize glycogen; and bars put something in your stomach while providing carbohydrates, salt and sometimes fat and protein. If you’re someone who feels hunger pangs while exercising, a bar or two might be a good addition.