robot with muscles

In "robot with muscles" do you refer to as a metaphor, or is it about a real robot with electro-chemical arms as in a living tissue ?

its a real robot by the use of electro active polymers (EAP) as sensors

Well, these are currently not very efficient in terms of power-to-weight ratio as compared to living tissue, that being for obvious reasons of millions of years of honing by natural selection.

Although used as actuators or sensors, could be considered to fit some required jobs, their potential use as a replacement for muscle tissue is yet to be seen.