Our expert says:
Difficult question. Well, actually, more like "vast" question, because that's a four year degree that would have to be summarized to answer it properly!
While you're spinning, or doing any other exercise, you don't actually have to eat anything. The session will be too short for your body to need anything while you compete. Before and after is another story, because that's where you need to adjust your food intake to make up for the added calories you'll burn when you train. Most of those must come from carbohydrates, not fat or protein, which is what people often do to increase food intake. The intake of food you need is dependent on the amount of exercise you do - endurance is relative, and some people, for example, will do 2 hours a day, others 45 minutes. Obviously, the more you do, the more you have to increase your diet to keep up.
Actual details on what you should be eating is something a dietician should tell you, however, and it would also help if your question is a little more specific, because as I said, yours is a vast, vast question, and has a very lengthy answer. So perhaps you should consider seeing a dietician, or refining the question, so that specific answers might be given.
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