Still on 4km, decided to vary pace and even did some power walking and still only 2min slower thank last time. Fartlek is the way to go for me I think.
My right knee has been creaky and crunchy for weeks but no pain but now has been a bit painful for the last 24 hours. I think it's going to be mainly power walking until that settles. As I tell my patients, listen to your body!
W2R1 and knee pain halts play
Does anyone else strap up their knee or knees when they run?
Bad knees and running? 
Knee pain during and after running
A Good start to the New Year, 6k
