Why is This Not Working?

Bentley thinks this is the way to get moving.  It never works but it sure is funny to watch.  He gets pretty mad after awhile.  He reminds me of a penguin sliding on their belly.

When he is on his back he puts his feet and hands on the floor and scoots himself backwards.  I think that is what he is trying to do but it doesn't work the same on your belly.