Intervals day today, 20 minutes warm up, 10x2 minutes at 5:20-5:30 min/km, my present threshold pace but managed to average 5:15 min/km and heart rate still in zone 4 so fitness definitely improving finishing with 10 minutes cool down # running #intervalrunning #thresholdrun #polarrunning #runnersofmastodon #RunningCommunity




















