User blog comment:JoePlay/Win A Comic-Con Exclusive Prize Pack/@comment-3568434-20110804015559

It would be the result of the SS serum

Captain America has no superhuman powers, although as a result of the Super-Soldier Serum and "Vita-Ray" treatment, he is transformed from a frail young man into a "perfect" specimen of human development and conditioning. Captain America's strength, endurance, agility, speed, reflexes, durability, and healing are at the highest limits of natural human potential. Rogers' body regularly replenishes the super-soldier serum; it does not wear off.[82] The formula enhances all of his metabolic functions and prevents the build-up of fatigue poisons in his muscles, giving him endurance far in excess of an ordinary human being. This accounts for many of his extraordinary feats, including bench pressing 1200 pounds (545 kg) and running a mile (1.6 km) in approximately 73 seconds.[83] Furthermore, his enhancements are the reason why he was able to survive being frozen in suspended animation for decades. Rogers cannot become intoxicated by alcohol, drugs, or impurities in the air and is immune to terrestrial diseases.[citation needed] He is also highly resistant to hypnosis or gases that could limit his focus.[84] The secrets of creating a super-soldier were lost with the death of its creator, Dr. Abraham Erskine.[85] However, in the ensuing decades there have been numerous secret attempts to recreate Erskine's treatment, only to have predominately all end in failure. Even worse, the attempts have instead often created psychopathic supervillains of which Captain America's 1950s imitator and Nuke are the most notorious examples. Rogers' battle experience and training make him an expert tactician and an excellent field commander, with his teammates frequently deferring to his orders in battle. Rogers' reflexes and senses are also extraordinarily keen. He has blended judo, western boxing, kickboxing, and gymnastics into his own unique fighting style and is a master of multiple martial arts. Years of practice with his indestructible shield make him able to aim and throw it with almost unerring accuracy. His skill with his shield is such that he can attack multiple targets in succession with a single throw or even cause a boomerang-like return from a throw to attack an enemy from behind. In canon, he is regarded by other skilled fighters as one of the best hand-to-hand combatants in the Marvel Universe.[86][87] Although the super-soldier serum is an important part of his strength, Rogers has shown himself still sufficiently capable against stronger opponents, even when the serum has been deactivated reverting him to his pre-Captain America physique.[88] Rogers has vast U.S. military knowledge and is often shown to be familiar with ongoing, classified Defense Department operations. He is an expert in combat strategy, survival, acrobatics, military strategy, piloting, and demolitions. Despite his high profile as one of the world's most popular and recognizable superheroes, Rogers also has a broad understanding of the espionage community, largely through his ongoing relationship with S.H.I.E.L.D. He occasionally makes forays into relatively mundane career fields, including commercial arts, comic book artistry, education (high school history), and law enforcement.