source: http://marvel.wikia.com/Sif_(Earth-616)
Powers
Sif possesses all of the various superhuman attributes common among the Asgardians
Superhuman Strength: Like all Asgardians, Sif is superhumanly strong and possesses greater physical strength than the average Asgardian female At her peak, Sif is able to lift about 30 tons
Superhuman Speed: Sif is capable of running and moving at speeds much greater than that of even the finest human athlete
Superhuman Stamina: Sif's musculature produces considerably less fatigue toxins during physical activity than the musculature of a human being She can exert herself at peak capacity for about 24 hours before fatigue begins to impair her
Superhuman Durability: Sif's body is much more resistant to physical harm than the body of a human being She is capable of withstanding great impact forces, exposure to temperature and pressure extremes, powerful energy blasts, and high caliber bullets without sustaining injury
Superhumanly Dense Tissue: Sif's bodily tissues have about 3 times the density as the bodily tissue of a human As a result, Sif is actually much heavier than she appears This increased tissue density also contributes somewhat to her physical strength
Superhuman Longevity: Like all Asgardians, Sif ages at a rate that is much slower than that of a human being However, Asgardians aren't completely immune to aging, as some other god pantheons are
Regenerative Healing Factor: Despite her body's resistance, Sif can be injured like any other Asgardian However, her metabolism enables her to rapidly regenerate damaged bodily tissue with greater speed and efficiency than a human being is capable of Injuries such as slashes and punctures can fully heal within hours, whereas broken bones can heal within a few days However, she isn't able to regenerate severed limbs or missing organs
Abilities
Sif is a formidable combatant and has recieved extensive training in unarmed combat and swordsmanship Among Asgardian women, her fighting ability is second only to Brunnhilde The Valkyrie
Strength level
Class 50; Sif is stronger than the average Asgardian woman, and is able to lift 30 tons
Weapons
Sif wields a special sword enchanted by Odin to enable her to cleave passageways between dimensions, primarily between Asgard and Earth, by a special pattern of swinging motions Also, during Ragnarok she used the sword Dragonfang after Valkyrie (Brunnhilde) was slain
