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Don't do it! I have made this mistake time after time. In my experience, it will only hurt you in the long run. Take for example my cold I caught last week. I new on Monday morning something wasn't right, and instead of taking the day off, I worked my butt off in a hard swim workout in the morning, had an extremely stressful work day, and then biked hard in the afternoon. Needless to say, I was feeling horrible before I even went to bed Monday night. This continued well into the weekend. So, if you are even feeling a cold coming on, take some Zicam (not an endorsement), get that rest, and take a small break in that hard training.