I have been "cross training" using burpees now and again. I do descending sets from 10, then go a 1 mile jog, then another lot of descending sets from 10, then a half mile jog. Doing this in an attempt to strengthen my legs and I figured it was kind of like interval training.. which I am trying to do to get a higher bleep test score. Does this sound like a waste of time? I mean I feel pretty knackered during the sets but could I be cross training in another more effective way? J.