If you teach your body to shift -(gradually) to a fat burning at higher levels of intensity common digestive issues and the need to fuel during exercise are reduced. (flippingfifty.com)
While you should maintain high level of intensity, your training sessions should not exceed the hour mark. (fitnessandpower.com)
The challenge for the customer, at the time it enters into the outsourcing agreement, is how to maintain the initial, high level of intensity throughout the term. (slaw.ca)