I am doing this now too. I do 5 minute warmups before I lift. Now I add 3 20-30 second sprints to it.

It probably is coincidence, but I'm feeling warmer at work where they usually have the AC turned too high. Perhaps my metabolism is revving up? I've also had some appetite suppression the last day or two. It could be from this, or the new probiotics I'm taking.

Well, we shall see!

Now, if I can keep from having an inadvertent carb-up, maybe I could see some weight loss!