I dont know if this is a problem or what, but if anyone has known, i was in and out of the hospital for the past two or so years. My dr said finally that I could start running about 2 months ago, then he said that I could start training about a month ago (weight training). Well..the weird thing is..I used to run about 4.25 miles a day, no prob.., but now??? Im running about 6.25 miles and im not even tired. Does not make sense to me. First thing i do is cardio. Ill be on the treadmill, cuz I can run on pavement, dirt, anything but a treadmill, as my joints really hurt if i do the next day. I can now run for 5 or so miles at about 6mph and ppl are just gaukin..Then i can go on an elliptical for another mile or so. I asked my Dr. about it and he said that im addicted to adrenaline. Is there such a thing. I mean this is kinda ridiculous. It appears that I have some kind of weird endurance or something. I cant stop. I wish i could..I dont know if this is good for me, but I can stop and if i do i feel not right, like my body needs it. Anyone ever hear of such a thing?