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Are there some muscles that we can't exercise?

Yes certain muscle in the body known as smooth muscles like the muscles of your esophagus, and intestines and bladder cannot be exercised and trained to be become stronger. All of the muscles of the body that move the body known as skeletal muscles, and the heart can be exercised to become stronger and more efficient. 
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Besides the muscles you can voluntarily exercise, there are others in your body that you have no control over—such as the ones around your intestines and esophagus. They're involuntary smooth muscles—and they're the ones that no amount of crunches can ever build up.
YOU: On A Diet Revised Edition: The Owner's Manual for Waist Management

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YOU: On A Diet Revised Edition: The Owner's Manual for Waist Management

For the first time in our history, scientists are uncovering astounding medical evidence about dieting -- and why so many of us struggle with our weight and the size of our waists. Now researchers...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.