People,
Plato tells us that the Atlantean kings were honorable because King Atlas was born of Poseidon, the celestial demigod of the waters. He also told us that the dynasty became corrupted because, over time, their blood was diluted with human mixtures.
Before the Krishna Avatar descended, He instructed the chief demigods to incarnate as humans in influential roles, such as warrior royalty, in order to participate in His activities. In the Case of Arjuna, of Bhagavad Gita fame, his mother, Kunti, was empregnated by Indra, the King of the Celestials. HIs brother Bhima was the son of Vaya through Kunti, and Vayu was the demigod of the winds. Yudhishtir was the most elder brother of Arjuna's, and he was the son of Yamaraj through Kunti. Yamaraj and his agents was/is the demigod that judges souls after their deaths.
Shikhandi was one of the chief warrior's of the Bhagavat Gita war, and fought in support of Arjuna. He was born as the daughter of King Drupada the King of Panchala.
Shikhandi became a male after agreeing to a sex exchange with a yaksha, a nature spirit.
Shikandi: Shikhandi - Wikipedia
Dronacharya was a teacher of martial arts and he was tied for first place, so to speak, with Bhishma for being the greatest warrior on the Earth. He taught almost all of the princes on the battlefield, including Arjuna. Although he had great affection for his student Arjuna, he was obliged to fight with the oppostion.
[Drona - Wikipedia] (Drona - Wikipedia)
Drona was born when his father, the great warrior Bhargava aka Parashuram, contemplated a heavenly dancing girl (of the type "apsaras") and apssed semen which fell into a pot. It was conserved, and a type of incubation took place such that Drona was born.
I imagine that this didn't just happen, Bhargava had learned ayurvedic medicine with the permission of the demigod Indra, and I think that genetic manipulation was involved in order to produce a warrior like Drona.
[Parashurama - Wikipedia] (Parashurama - Wikipedia)
Everyone that I have mentioned above was superhuman in skills, speed, intelligence and so much more.
Great science was known in the past, beyond what we can produce at the present time.
Cheers!