History
Sif possessed the conventional attributes of an Asgardian woman ("goddess"). Like all Asgardians, she is extremely long-lived (although not immortal like the Olympians), superhumanly strong (the avenger Asgardian female can lift about 25 tons; Sif can life 30 tons) immune to all diseases, and resistant to conventional injury (Asgardian flesh and bone is about 3 times as dense as similar human tissue, contributing to all Asgardians' superhuman strength and weight).[1]