First of all, what I'm about to describe has only started happening this week. From release day till then, activities and workouts were working perfectly. Also note my Watch is at v1.0.1 and I wear it on the 2nd last hole of the Sport band, which is plenty tight - although for the soccer game mentioned below, I put it on the last hole so it was really snug, just to see if that helped. So, on Thursday 4th June, I went for a run from 12:13 to 12:43. I set the Workout on Watch to "Outdoor Run", as usual, Open Goal, and off we went. Usually on such a run my heart rate would reach around 120-130bpm. I did 3.6 miles, 29 mins, 376 activity calories, 8 mins per mile, according to Workout app. All good, seems normal. Except my Average Heart rate shows as 202bpm!! See screenshot: Now I'm assuming I'd be dead if it really was averaging 202. So I checked the Health app on iPhone, here's a screenshot of the heart rate data from the time period of the run: As you can see, it hasn't recorded (or at least synced) a heart rate at all for the run, apart from the last minute (12:42, remember the run was 12:13 to 12:43). It has my heart rate at over 200 for the last few minutes of the run! So last night, Fri 5th June, I play soccer, outdoors, from about 8pm till 9pm, as usual for a Friday. As usual, I start an Other activity in Workout app. The Workout app records it fine, 574 active calories, 49 mins. Except it just has a dash for average heart rate, no figure: Flick back to the Activity app, and whilst the workout is logged is logged as a 574 calorie Other workout, the Steps and Distance have not logged (Steps would normally be closer to 10,000 after a 50 minute soccer game and distance would be much more than 1.97 miles): Also, no Exercise minutes have been logged for it: And the Movie calories and progress wheels are also not updated: What on Earth is going on here???? My main reason for spending £339 on an Apple Watch is for fitness tracking!