this is a really stupid question,but when you do cardio on an empty stomach in the morning, do you have to eliminate water too, or does this just refer to food because i need to drink water when i do cardio.
Water is fine.. You should always drink water before you do any kind of exercise. The only reason not to eat is to keep your blood sugar down so that you are forced to use your body fat for energy and not the carbs from the breakfast you just ate. If you're going to take a thermogenic like ECA, this a good time to take that too. Get up and take it on an empty stomach with water, and then do your cardio.
Yes, you need water. It's essential to proper bodily functions. Drink water prior to starting cardio and make sure to have water during cardio, because dehydration is very unhealthy.
No, water will not hurt your cardio or anything else for that matter.