Another tough one...

This week I have to do two fast runs. Did the 18 km run @ 4:01 min/km on Tuesday. Today I had to do intervals 7k-4k-3k-2k @3:56 min/km with 1k jog in-between. This was a tough workout! 4k into the first set my legs were done. Had to push all the time really hard but finally managed to keep the pace.