There's no escaping the abs here! Feel the burn.
With focus on rectus abdominis (your 6 pack muscle - even if you don't think you have one, you do!) and your obliques (your side waist).

Make sure there is no build up of tension in the back of your neck. Use your hands to support your head, or rest down for a break if it gets too much.

If you're wanting to really target and tone your abs, work on the Abs Express series 3x weekly, or every other day for optimum toning.