I want to try motocross. You need a helmet, (a) knee pads, (a) elbow-patches, a motocycle and (a) special clothes to go motocross.

I want to try scuba-diving. You need a bottle of oxygen, a neoprene suit and (a) flippers  to go scuba-diving

I want to try taekwondo. You need a kimono and a belt to do ( go) Taekwondo.