Hinduism includes, not unlike other cultures and religions, a lot of mythical events and people.
For example, they say that:
Lord Krishna was real and lived from 3200BC.
The Kurukshetra War was real and took place 5000BC to 6000BC.
And that Indian martial art styles, such as kalariPayattu date back 6000 years, that SilamBam date back 7000 years and also other battles that happened 9000 years ago.
From what I've read, the oldest Indian martial art style is only about 3000 years old. Is there any evidence that any of these battles and martial art systems were in existence thousands of years ago?

Check the date of the martial art style on this site as well.