I actually solved this problem on my gear s2. Open S health, scroll all the way over to settings. Open settings and scroll down to "health nudges". Torn them all off. Then go back to settings and scroll down to "workout detection". Turn those all off as well. Basically turn everything off in S health you can. This solved the problem for me! No more telling me I'm cycling while walking around at work!
First, My watch just did an update (updated to 2CPK8) in the past week, that is when my issues began with Activity Notifications and since the S Health Setting solution did not work for me (I have not done the setup of S Health and I have all S Health notifications from the phone turned OFF). I discovered when I got a watch notification I could scroll down and open the setting on the watch, I was able to then disable the notifications on the watch.
another item with text responses from the watch surfaced after the update.
With my previous software when I received a text, I could tap reply, tap the mic icon and speak the text response, when I finished talking, the watch would allow me to review and send the message. That was no longer happening with the 2CPK8 software. I found if I double tap the screen after speaking an option to send the text as "text" or "voice" appeared. By tapping textthe text would be sent as before. Just an FYI..
I finally figured it out! Actually others posted the solution so they get the credit, but they did not post very detailed instructions so I kept thinking they must be referring to an older version of the app than I have on my watch because when they said "rotate the watch bezel in the S-Health app to "settings", for me rotating the bezel did absolutely nothing so I could not for the life of me figure out how to get into S-Health's settings.
That should do it!
Go to the menu on the Gear S2. Scroll or rotate the bezel to the S Health. Once in S Health on watch, swipe left until you get to 'Settings'. Scroll up until you get to 'Workout detection'. Grey out the ones you don't want. I unchecked (greyed out) cycling, elliptical, row machine. You can uncheck dynamic too if you wish..
hope this helps..