work out for half an hour a day doing what?
I do elliptical. It adjusts intensity automatically to maintain a heartrate between 156 and 166 -- 161 being ideal for my age.
After 30 minutes I'm just done. I try to up to 35 but I haven't really adjusted to the workout enough so that I can up the length.
And I do use weights. There's a big machine downstairs with a list of 13 or so different lifts you can do and I do one set (Chest / Shoulders / Back / Lower Body / Total Body) every day, 8 reps of a heavy load that leaves me shaking after the 8th.
Today was kind of bad, though. Even though I did everything perfectly and met expectations, I did it at 2pm after having only eaten 450 calories for the day. I was at walmart with my mom when she noticed I was having cold sweats and kind of out of it. I keep forgetting to eat.