Where is there a physical despcription of Winston in "1984" by George Orwell?

We learn about Winston's appearance in the beginning of 1984. 

The physical description of Winston, like the description of the Victory Appartments, shows us how pathetic the average man is in 1984. Winston is scrawny, red-faced, out of shape and he has a varicose ulcer that makes it difficult for him to even climb a flight of stairs. He is unhealthy and run down. When compared to the rugged manly features of Big Brother, he seems even more pathetic.

Winston is an unlikely hero. Where most heros are above average, he is below. In fact, he is nothing like a classic hero. From his physical description, we understand we have a protagonist who is not fit for the role--he should be strong, but he is weak. This makes him more attractive on some levels, for he is very much an underdog. It is not likely that a man in his condition will succeed in changing the world.