Now, that some of us have gotten off the couch and started exercising, experts say we should be wary of doing too much, according to an Associated Press article.

Overzealous exercisers can run their way to stress fractures, spin their way to insomnia or even overdo it to the point their immune systems are compromised.

The real sweet spot, as you would expect there to be in any biologic system, is around an hour a day," said Dr. Mehmet Oz, a surgeon at Columbia University and co-author of "You: The Owner's Manual." "After that, it's hard to show a great benefit."

There have definitely been times when I have been guilty, especially if I was trying to make up for cheating on my diet. When I went overboard, my body was sluggish and tired and I was more prone to injury.

Check out the article to see the other warning signs and when to know you should get off the treadmill and out of the gym.

-- Amanda Barrett, amNY.com