To run a marathon you must be over 5 feet and have a healthy heart. If you are not over 5 feet and do not have a healthy heart, you cannot run the marathon. Right this statement in symbols.

Let a(x) be the assertion "x can run the marathon"

For the first statement I got $\displaystyle (over 5 feet) \wedge (healthy heart) \rightarrow a(x)$

For the second statement I got $\displaystyle \neg (over 5 feet) \wedge \neg (healthy heart) \rightarrow \neg a(x)$

I have a feeling this is wrong because if the hypothesis is false then the statment is true, if I don't use implication what do I use?