Cervical Hyperextension: Stop Doing That
People don't think much about the health of their neck – at least not until they hit their 40s and 50s and realize that they've woken up with numbness and non-functioning muscles in their arms because they've blown a disc.
These issues have a lot to do with people being stuck in a forward head posture at computers. However, you can magnify these problems by doing various exercises in cervical hyperextension when you should be in neutral. One example is the chin-up. You should not be "reaching" for the bar with your chin. If you really think about it, it ought to be called a chest-up.
Bad Chin-Up: Cervical hyperextension
Good Chin-Up: No reaching for the bar with the chin
And by the way, you can't do a good chin-up with a baseball cap on, assuming it's facing forward. This also causes you to have to go into cervical hyperextension to clear the bar.