There are many unusual and extreme sports in the world that We`ve never practised.
In the air we can jump from a plane with parachute. I think this is a very extreme sport and dangerous too.
In the water we can practise canoying on a river with strong flows. You must wear waterproof vest in case you fall over the water.
In the mountains we can climb or scale a cliff. We need an excelent health and fix too. We have to use a good equipment for this sport.
In the city we can do many urban sports like skating between cars or cycling at the city centre. That´s very dangerous too and you have to take care with the cars and pedestrians because you can cause an accident.