We’d bet that even the biggest fitness junkies among us have had this moment: You’ve just woken up and the thought creeps in…Maybe I could just work out from bed, for a change? When you’re pressed for time, dreading the rain/sleet/snow/whatever weather outside, or just feeling blah about walking to the gym at the moment, it’s tempting. But if you’re quick to dismiss the thought as nothing but a lazy Saturday morning fantasy, you’ll definitely want to hear what Erika Bloom, Pilates guru and celebrity instructor, has to say. Apparently you really can get a great workout from bed (other than, you know, the obvious cardio-in-bed workout). “The beauty of Pilates is that it can be done anywhere,” says Bloom. “And the bed is a great, easy place to get a toning, lengthening workout using just your body weight.” Plus, the springiness of the mattress provides a little extra dose of resistance. We asked Bloom to create a series of killer, bed-centric exercises with all of this in mind. While her routine below will still make your muscles quake, you only have to slip out from underneath your comforter to do it—before promptly...