I am a firm believer in the methods of Crossfit training, even though, high intensity training can be difficult while on an insulin regimen. I always carry a GU Pack (sports gel) in my pocket for lows. However, recently I have noticed with my CGM (continuous glucose monitor), that after high intensity workouts, my blood sugar can sky-rocket. I learned that your liver will release "sugar" stores to provide your body with energy. Either way, I just try to keep an eye on it before and after and STOP and pop a GU Pack if I start to feel shaky. Take a look at my record breaking jump below :)
http://www.trainedbyinsulin.com/1/post/2012/12/crossfit-trained-by-insulin.html