weak ankle, is there anything I can do to strenthen it?

So i've always ben athletic, played soccer a lot, been skateboarding since i was a kid and still do. With skating you move your ankle a lot with the way you flick the board and what not. I've been noticing lately when I go to skate if i land on my foot a certain way I get a sharp pain in my ankle even if i haven't actually fallen on it. It feels like it's forever been sore and weak. Is there anything I can do to fix that? my other ankle doesn't feel that bad but my right one bugs me quite a bit. Any help/tips would be greatly appreciated