The Push Up is the King of all horizontal pushing movements, and a standard exercise here at The Human Form.
Baring orthopedic injury, EVERYONE can perform some version of the push up.
In the short instructional video below, Coach James demonstrates the details of the perfect push up form, as well as numerous variations to appropriately challenge the newbie to the seasoned veteran.
The key to injury-free training is to pay strict attention to exercise form, and the push up is no exception.
Test and see which version you can perform with perfect form, and then challenge yourself.