1. turn on IK for the feet

2. grab the hip group

3. Zrotate

The morphing tool is also your friend.

the vast majority of poses on the market are rushed, and dont have any consideration given to having hands/feet properly grounded on the floor (or on the figure if they are contacting it), much less any thought put towards physics/gravity/balance/etc.

but this is a product of the marketplace, where packs of '1000 poses' are seen as a great value. personally, id rather have 5 good poses than 1000 rushed ones.

 

"I never buy poses, I use my mirror."

a mirror is definitely essential for correcting poses, or creating ones that look natural.