Originally Posted by iMiZFiT
Doing long steadystate cardio can actually cause you to lose muscle as your body adapts by shaping your muscles to perform better at long distance and lose some of the muscle designed for shorter sprints (According to Askmen.com)
In my opinion Interval training is the best and least time consuming.
True, if you're massive and do massive amounts of cardio. Running for 40 minutes a few times a week won't burn an ounce of muscle, if you refuel properly. Since your body uses fat as it's main source of energy during low intensity cardio, a lot of research would recommend doing long bouts of low intensity cardio; hence you see body builders doing 40 boring-ass-fucking minutes on the elliptical a lot.
and interval training > then long distance low intensity training. I do like a nice long run though, and I have tons of audiobooks on my Ipod, so I enjoy it. But I love doing HIIT at the gym as well. because it's "the best and least time consuming."