If you have time for some exercise on a daily basis, go for it! It's good for you. Now, if you are doing strength training/lifting weights, you should not work the same muscles on consecutive days. This is because when doing working your muscles intensely (or "anaerobically"), your muscle fibers actually break down somewhat. These fibers then regenerate and become even stronger, but the rest period between workouts is what allows this to happen. P.S. - Don't exercise when you're injured, either.
eating right and exercising everyday
By eating healthy foods & exercising everyday!
yes
At least 20 minutes a day.
depends what excersize
by exercising everyday
No.
Why would you think that? Of course not.
YES
No
Energy expenditure is that amount of calories that someone uses in one day by exercising or doing everyday tasks.
No, you should rest your muscle for AT LEAST 24 hours before exercising it again.