all the time
I have worked out 5 or 6 days a week all summer. Usually I do 40 minutes of cardio at the gym (mostly running on the treadmill), or I go running outside in my neighborhood if it's not too hot.
Running has really gotten me in shape (esp. my lower body) way better than the elliptical machine ever did, back when that was my main form of cardio.
I've lost 12 pounds this summer. When school starts up again, I probably won't have the time or desire to work out almost every day, but I know there's no way I'll be able to keep the weight off unless I go running four days a week, at least.
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