So I'm a novice rider who started riding this year. Since Jan 1st I did about 2 rides a week the longest being about 50 miles. About a month ago I got sick and didn't ride up until last week. On my first ride back after about 30 days I went alone and rode a little harder than I usually do. After 8 miles I stopped took a 10 minute break and turned back. This was 6 days ago and my but is still killing me. I'm fine after I get up and about but if I sit for long I get up and walk like I'm crippled. Is this normal? Did I just over work myself? My first ride wasn't this painful.