The prime mover of wrist extension is the .

The primary muscles involved in wrist extension, which act on the wrist only, are the extensor carpi radialis longus, extensor carpi radialis brevis and the extensor carpi ulnaris. All of these muscles need to be fired simultaneously to avoid any radial or ulnar deviation with extension.

hello, i am sorry but i dont feel that this is anything that anyone can you with! this is based off of what you learned and how you felt form the exercises if you ever need anything else let me know!