Weird Sports
Tennis and running are not really original and the chance you will be world champion in this is not very big, probably. Maybe you can try one of below sports.
Chess Boxes
Rounds of playing chess and boxes are alternated.
Bog Snorkelling
The only thing you need are flippers and a snorkel.
Wife Carrying
Men have to run with a woman on their backs.
Extreme ironing
Iron on extreme places.
Man Vs Horse Marathon
A competition between men and horses.