Training by heart rate has proven to be more accurate for me. I can't figure out how to set my watch to give daily suggestions in heart rate instead of pace........ I figured the heart rate thing out. Anyone else had problems with Spotify? Worked seamlessly with my 745 kind of disappointed. Says it's connected watch says it's playing but can't hear anything on my jaybirds tried over and over to forget and repair. Re download my music! Hellppp.