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Why do my thighs hurt so much? - why do i have really bad groin and thigh pain

I have 5-km run than a month after my 5k I am inclined to exercise regularly works hands free, yesterday decided to handle 4 sets of 15 to each of them sitting on my routine and when I woke up my legs a lot, I say I am very athletic and obviously hurt, I'm used to pain that comes with the daily routine, but that does beyond that and can not really understand why I have been twice as high and almost 3 times as many sit-ups for more than a month, but never angry with this difficult and I had assumed that my thighs would be quite strong because I am used to run very steep slope. Has anyone any idea why my legs hurt. I have to go to MI to lose my habits, so that all persons9; SA regular driver, of course, you can understand my pain. Answers would be very grateful

Oh, and the pain is usually on the front of the thigh below the groin and above the knees