Advice Needed on Full Wheel

Photo via FYeahYoga.

Do you practice full wheel? I'd love your advice on how to strengthen the wrists for this pose. I usually find they feel the weakest. 

I'm guessing that simply holding the pose for longer intervals would help, slowly working my way to a minute or so. Yesterday I also did some stretching on the wall with my arms straight out from the shoulders, hands turned outward, flat on the wall surface. Leaning my body weight into the palms provides a good challenge.

Have any other tips?

As a side note, I've always thought tiny wrists are beautiful and have wished for some delicate ones myself. But I didn't consider the importance of having strength for poses like this. Now, I can be grateful for my wider, more capable joints! :)