How many calories of fat vs carbs and protein can i burn during a 600 calorie burning session during biking?

Burning carbs-fat-pr: Seriously, this concept is butchered by personal trainers. Consider it 100% fat. Yes, you'll burn carbs (glycogen) along with fat but you'll replace the glycogen over 24 hrs. If you don't load up on carbohydrates you'll manage to keep blood sugar and Insulin levels low. Therefore, you'll be replacing glycogen by burning more fat. Avoid sweets and starches to do this successfully.