We mallus grow beard, wear lungies, talk our own English….. and we play kalaputtu, in your language “ Bull race”. But I haven’t seen kalaputtu in my life till last January, I should feel ashamed about that but at last I did it, I mean I saw it in real 
In Kerala it happens just after the harvesting before fields are ready for the next reason. The rules as far as I know: you have to go for one round, who reach fastest is the winner and most importantly the rider shouldn’t fall/apart from bull.
Check some snaps i took
Entry to the place
A farmer taiking his Cruiser to the track
Ferrari on the track 
You can see people holding a rope, this just make sure tat the bull running in the direction they want.
From another angle
The Rider belive me its really hard and he must be very tough guy
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wow yar…amazing culture…..we dnt find dis in north..
Thats why we called “The Incredible India”…. we are all different with one soul under one roof .