running 25:00 [3] 2.5 mi (10:00 / mi)
Set off to do Stepping Stones. For 4 minutes I was running properly - a decent pace (7 minute miles-ish), heart rate sound if a little high (155-160), feeling quite good. Then I slowed to go through a stile and bam - heart rate 195, legs wobbly. I just jogged from there, and came back by the top bridge and Weetwood Lane. HR settled down again after a few minutes.