The Apple Watch has become a staple on my wrist since its debut with series 0. But I was never willing to invest heavily in a stainless device which was going to become outdated, quickly. Despite my space grey aluminium becoming scratched up to the max (both on the case and the screen), I don’t regret my choice. A big reason behind getting the watch was for fitness, the fact I could accurately log all of my daily activity without lugging around a phone to do my strength training was all part of the appeal, but to be honest the watch didn’t fully deliver. Why? Everyone with series 0 knows this thing was sluggish as hell! And I mean super sluggish. With continuing OS releases, the thing would struggle just to open the workout app. Before the latest watch os 4 release, my watch used to crash just starting a workout sometimes. Then the HR monitoring… Well this was cool, but more a gimmick. It worked pretty well for running, but it sucked sucked sucked for strength training and gym based activities. Not only would it completely lose track of my HR during repetitions, it would play a 2 minute catch-up game to retrieve a beat, which would be pointless as I was then ready for my next set. And then when it decided to half that to a 1-minute catch up time, it would often decide that my heartrate should be half of what it was. 56 bpm after having just finished doing a set of chin ups, I don’t think so Apple. Of course, this could all be solved with a BT heart rate chest monitor, but the simplicity and point of the AW really is to remove the need for such devices. Well, I’m pleased that the one big gripe with the AW seems largely solved. Now I can’t comment on generation’s in-between series 0 and 4, but as the HR sensor is largely the same design I would assume little had changed. Finally, the AW, is able to (seemingly accurately) keep track of my heart rate through a strength workout (especially one involving arms)! Dumbbell shoulder raises no longer cause the apple watch to enter a flurry, and the milliseconds it takes to re-find my heart rate, result in it landing on the correct figure, and not the half it should be. While it’s difficult to accurately calculate calorie burned during a strength-based workout, Apple finally make a convincing case that the Series 4 watch is the watch to have if you’re more serious about your strength training. I’m super happy with this purchase, and the stainless case (with black sport band for workout) has been perfect. Tl,dr; the watch is great for fitness training, and is able to accurately pinpoint my heartbeat after doing sets.