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Why do muscles sometimes shake during lifts? I know it's normal, but why does it happen? I've searched the web for a good reason why muscles quiver and didn't find a clear answer. For instance, my chest always shakes during MIS. My other muscles rarely shake even if I work to complete...

One of Santa's elves let it slip that I'll be getting CTX for Christmas. (I've been a very good girl.) My worry is that the cardio sections aren't going to be long enough. Do the muscle segments keep you in the fat burning range? How about leaner legs -- is it intense enough to work as a...