i have been over sees working so i dont get on here that much. i just got back to the states and went on a hike this past sunday.. got my heart rate way up and broke out into a great sweat. wekk monday i felt reallly sore of course but also had a fever and headache... is it possible to get the flu from cardio? shock maybe? cuz it had been several months since i got to do any... thanks for any info, its wnzday and i still feel like shit been taken ibuprof 800mg 3x a day