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Maybe the participant is the fire, interacting with the three other elements?

This year I'm doing a "Swedish Classic", which is 4 long distance races throughout the year. Three of them are the classics in triathlon, but the fourth is cross country skiing (or "nordic skiing"). So the opposite of fire, hmm, but could maybe say that fire is what makes it possible to traverse 90km of mountains in the winter.

Biathlon is ice and fire.

Martial Arts Kata comes to mind. Explosive.

How about swimming in an onsen swimming pool (make one if not exist)?

I used to do a mini triathlon, it feels like hell already!

The fourth sport in a regular triathlon is transition. You burn away any lead you had (as you can't get your shoes on etc) and emerge from the flames reborn as a new type of athlete.