hi, i went to a boxercise class 5 days ago. The following day I felt a bit stiff but I stood that night working and was freezing to the point were I could not get warmed when I went to bed. The next day and since then my thighs are so sore to the point were going up and down stairs is agony. I have taken ibuprofen, used deep heat and have only had a marginal improvement. What has happened and what would help. I have 2 heat wraps on at minute and I feel some relief