Nitric Rush If you are wondering how to build muscle back after being ill for a long time, then the first person you should ask is your doctor. Any long term illness can deplete the muscles, either because of the illness itself or because you haven't been able to get to the gym due to being sick. Rest assured, you can build muscle back after being ill, but it will be just like starting over. Check with your doctor to see if you are physically up to the challenge.

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