Hands-behind-back pose.

I have no clue what this pose is called, but I've seen several pictures of women doing it, and I love it.

One of my favourite poses too.

I think its a most muscular pose variant as discussed on this forum thread link

Sharon Marvel liked doing it:

Sharon Marvel hands behind back pose 2mins16 or thereabouts

Denise Rutkowski:

Whole video dedicated to Denise doing the pose

Bev Francis

Christa Bauch did it the best.