If you find it challenging on the floor try it against the wall until you build up strength. This is a good option to start with, especially if you have wrist pain.
Remember to angle your body away from the wall to give more challenge and keep your core engaged to prevent your back arching and causing you pain.
Keep your chest pressing away from the wall to avoid collapsing your head and neck towards the wall to much.
Did you like this modification? If so let me know how you go in the comments below.