Even today, the some of the best Atheletes from India are from Chozha (Tamil nadu) or Chera (Kerala) empire. Our golden girl PT Usha was originally from Kerala and got trained in Tamilnadu.
We don't say Chozhas are best in the world like Mahabarath and Ramayan says. The History says that they defeated small empires through out India and middle east and annexed them. Go read history