So I've just picked up a galaxy watch. Went to the gym with my buddy who has the S3 watch and his watch detected his workout within 10 minutes of working out and recorded the whole thing. My watch hasnt recorded a single minute of it. We did the same exercises for the same amount of time.
I checked the settings and auto detect dynamic workout is checked. The HR setting is set to always ans I can see my HR was elevated over 100 for the whole workout but the watch hasnt detected the dynamic workout my friends has.