I was wondering what the response would be to increasing intensity of cardio sessions, but not duration, as it pertains to conditioning in a competitive bodybuilder. If you're familiar with the concept of density in the weight room you'll know it means doing more work in the same period of time, and for me that has been an effective tool.
So for example, say I'm starting my cardio doing a 20 minute session on the track and I get 2.5 miles. The next session I shoot for 2.75. Then 3. With a solid nutrition program in place and adequate rest, would this jeopardize muscle (with or without chem assistance) and how would it compare to standard LISS or HIIT training (both of which I currently use.)? I spoke with a trainer advocating this as contest prep cardio, but had my reservations so I thought I'd see what AM had to say.