You need to stretch after you Nordic walking session. In this video discover the stretching techniques of Olivier Capelli, double Nordic walking world champion.
Learn to stretch your calves - essential for driving your body forward - using your poles, as well as the thighs and the gluteus maximus which also get a thorough workout when Nordic walking. Take the time to do these exercises after each of your sessions to recover properly.
Take care to only stretch your muscles when your muscles are hot, either after the warm up or at the end of your session.