Do you mean poses for a muscular female or muscles to add to a female figure?

DAZ has SheFreak 4 which is muscular female,

http://www.daz3d.com/i/3d-models/-/she-freak-v4?item=9499 

and she has some good poses showing self off,

http://www.daz3d.com/i/3d-models/0/sensational-she-freak?item=9578 

There is also muscle morph for V4 figure,

http://www.daz3d.com/i/3d-models/-/victoria-4-2?item=3940

which give variety of possibility