Ok so i am hoping someone has the answer for this- I still have my first gen watch and its actually in great shape- the cellular isnt that compelling for me to dump a perfectly good watch but the heart rate stuff looks really great! I had heart surgery a month ago so thats pretty important. Is that exclusive to the series 3 or is that in watch os4 software? I am running the beta of 4 and don't see it in there- I know they hold some things for the general release tho... Anyone know?