No tunes this morning so decided to use my HRM to do some fartleking. Warmed up, ran for a bit then used the HRM to track my heart rate up to 160 then walked until it got to 143 then ran again up to 160. Actually enjoyed mucking about and it may be good for speed as well. Nice jaggedy heart rate as you can see. Very cold this morning and thought I might need to buy some gloves but was pretty toasty by the end of my run
Happy running all