The Riddle is Back

All of a sudden, after a couple of glorious weeks, I'm proceeding on a downward spiral. I'm tired as whatever and the mysterious hollowness in my hamstrings is back. I'm not gonna stop here that's for sure. Maybe this is again just another bump on the runway... I've had worse. Today consisted only a 3 miles shake off and 5*100m strides and some streching.