How to Avoid Shoulder Injury when doing Dips and Sit Ups?

Question: Thought you had mentioned in some previous emails that the dips and sit ups could lead to shoulder injury. Why are you now encouraging your readers to do them ? 

My recommendation is to keep your shoulder extension to less than 45 degrees. You can do this by modifying your dip technique or leavening the range of your dip.

Some other great core exercises are:

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