While all exercise will oxidize glucose to some extent, high intensity is defined by the production of lactate when you overwhelm the oxidative capacity of the muscles and instead of generating further energy from pyruvate ( the end product of glycolysis ) the excess pyruvate is converted to lactate which is shunted to the liver for gluconeogenesis.
So, if you don't feel the burn ... well, you're not really at high intensity.
-PK



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I was just thinking more along the lines of just a little extra something to do throughout the day. Like parking at the end of the parking lot sort of thing. 

