I saw a movie about 3 years ago about a kung fu fighter who had to battle 4 groups of people. Each group used an element (fire, water, air, earth) to camouflage themselves during the fight. The only part I remember really well was when the fighter had to battle the group using earth. They were in these fox holes in the ground and they used wooden harpoons to strike the fighters above ground. I think at the end someone may have dove off a water fall. Thanks for you help! It is driving me crazy not knowing what this movie is

It sounds like you're looking for the same movie as I am, does this sound like the same movie?

O.K. guys, here's the hard par then I guess, to figure out the last movie.
I'm pretty sure 3 guys, they train individually in the forest before they all fight one on one battles against their rivals, one had the bo staff, the other had what I can best describe as roughly 5 metal pieces, about the size of a rule for each one, and linked together with loops so it can swing around, and it had a knife on the end of it, I remember when he was training with it, he'd whip it around and then put it under his foot and the flick it forward and it would go through the bamboo tree or what not.

I am trying to remember, was SO LONG AGO about the last guy, could have been 5 guys, I'm thinking it might have been just 3 guys though.
Can't think of the weapon the last guy used.
The bo staff guy during the fight in which they fought what I believe was a small stream with a couple inches of water and he swuung the staff left and right and made the water come up like a wave, and I am 99.9% sure they all had different parts of earthor what not, like one was called earth, the other wind, and the other water, or something along those lines, it's the last and only movie in my life I am trying to figure out from my childhood memories, if ANYONE can remember this I'd love it.

The op's movie sounds like it could be Five Element Ninjas: Ren zhe wu di (1982). Not sure if it's what you're looking for though.