Re: Good Idea
You will probably hear a lot of good things about excercising in the morning and good about in the evening as well. Personally, I like to resistance train in the morning, because anerobic (sp) excercise gets your metabolism up for the day, whereas aerobic gets it up for only 30 mins or so after the activity. Doing my cardio at night makes me feel like I'm "cleaning up", or just burning off those last calories of the day so I can start tomorow fresh. That's only if you have the time, though.
Whatever happens, DON'T get the mentality "if I can't do it in the morning like usual, I'm better off skipping my workout today". I can't stress that enough. Do whatever you can do, and don't blow off your workout if you just have 20 mins available instead of 40. That's how people stop working out in the first place.