is there a better way to do this sort of thing?

it seems so ineffecient...

Code:

---

        if (aTime>0) {
                aTime--;
        }
        if (dTime>0) {
                dTime--;
        }
        if (stamina<100) {
                stamina++;
        }
        if (stamina<0) {
                stamina = 0;
        }

---

Looks good, not much you can do to improve it.