Originally Posted by
Jbo26
On these fasted rides I can average 18.5 to 20 mph climbing over 5,600 ft elevation, burning over 6,000 cals. Some might think you are cycling without energy, but you are using ketones from your own fat stores for calories. Granted, if you have low fat on you this can be dangerous, but I have plenty of fat to burn.
I have a ton of fat to burn too ... but fat tends to burn slowly and steadily---a diesel engine---and this leaves an energy deficit if one tries to say , attack a hill, or sprint to catch alight.
You however, seem to have built up this capacity. if it works, it works ..... we are all different.