The pedometer and heart rate sensor may not work properly on some watches with a specific software version. The issue will be resolved by a software update. For a temporary solution, reboot the watch when the problem is detected, and then disable the Elliptical trainer and Rowing machine setting. (The menu options may vary by the watch.)
Note: Use the paired phone to check for software updates via the Galaxy Wearable app for the watch.
From the Apps screen, touch Samsung Health.
Rotate the bezel to and touch Settings.
Touch Workout detection.
Touch the switch to turn Off the Elliptical trainer and Rowing machine. (The icon will turn gray when the function is turned off.)