The best advice is to follow the recommendation in the book and take 2 weeks off from exercising while you're body adapts to burning a different source of fuel.

You do not have to give up exercise - but you do need to allow your body to adapt. Two weeks tends to do it for most of us. Use this time to learn about your plan and to get through that 'icky' phase. Be sure you're eating enough, drinking enough water and taking the recommended supplements (esp. potassium in this heat).

Then ease back into exercise. It will take a little while to build back up to your pre-LC intensity level, but you'll get there - with energy to spare. You'll also have to increase carbs a little from Induction levels. <20g a day is not sufficient for intense exercise (again, this is covered in the book). During your two week vacation from exercise looking through DANDR for information on how to proceed to OWL (Ongoing Weight Loss) would be a good idea - you'll have all the information needed to increase carbs and be ready to get back at the biking.

HTH
Nat