I just started doing two workouts a day this week. I'm on day 5, and I'm pretty tired at times during the day, but that's to be expected. It'll be interesting to see how long before I adjust to the increased workload.
I've noticed that I'm not sleeping as well, and I suspect the cardio session around 8pm might be the reason. When I do fall asleep, I wake up ready to go at 3am.
It takes me about an hour to fall back asleep, but then I'm ready to go again at 6:30am. Weird.
Today, I switched and did cardio in the early AM, weights in the late afternoon. I hope that helps. Not that I mind having more energy, but 3am energy isn't quite what I was looking for.
I'll check back in next week. If this works well for me, I'll write down what I did and perhaps put together a rotation. (I have to see if I survive this first!
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My initial impression: I like getting the extra cardio in, and I'm putting more effort into the lower body as well (B&G, GSL, and PLB). I'm not trying to lose a large amount of weight ~ I'm only trying to lean out a bit. So far I'm down one pound.