Starting Over Again!!

Ran 4 X 100 fast and felt great.  The first of 4 X 50m I felt a little grab in the very same spot on the inside of my left leg I have been injured with for six weeks.  Don't think it's bad but back to the drawing board.  Clearly I have lost my base conditioning and need to start over.  I'm super strong and super fast but my body can no longer take these bursts.  Need to totally revisit base conditioning.  Already started in the gym.  Bubba

Motley Crue - "Kickstart My Heart" - https://www.youtube.com/watch?v=CmXWkMlKFkI