Running 20:41  5.02 km (4:07 / km) +65m 3:52 / km
Went out for a bit of a push. I've been coughing almost not at all today so i thought it'd be okay. Chest pain transition from a dull ache to more of a sharp pain round the 4km though - maybe just the cold air and a bit of a shock to the system lol. Ankle still sore.
Optical HR useless as usual.