I am back to riding a few days a week to work. It is a nice change and is a great 20-25 minute workout. I try not ride so much to sweat- but a easy workout is good for the body and soul. If you do not eat or drink in the AM before you ride- you will trick your body into burning fat. This happens because when you sleep you burn fat reserves and will continue to burn fat for those first 30-60 minutes after you get up. During your workout or ride, if you start to feel light headed or get a headache you have gone to far. So eat and drink at that point. Be careful not to bonk.