Yes, hilly, as BR says, take it easy if racing at the weekend. You could do treadie running, but I wouldn't do the twice a day running with a cold.
There's a bloke at our club who did quite hard running through a cold one year, and ended up in hospital with pneumonia and restricted training for the next 3months. I have to take it easier during colds as my asthma gives me one of those horrid, annoying (to everyone) coughs!