I really don't know what's going on, only a few days ago I ran for 20mins no problem today I really really struggled with 2 x 10 min runs. I know I'm well hydrated I ran at the normal pace. I really can't see what's going on. My shins hurt like hell my calves ached like never before even my ankles hurt.
I plan on doing the 25 minute run on Sunday or Monday I just hope it all sorts it self out for then.