If you are referring to the Tempo Training application, make sure to progress through all of the tutorial screens by tapping the touchscreen to progress all of the way through until "Great Job!" appears on the last screen, which will then lead to the Tempo Training data screen ready to measure swings.
After considering the above info, if you are past the tips tutorial and not getting swing data using the Tempo Training activity app...my suggestion is to open the main settings menu on the S70 by tapping the middle button from the regular time screen > Select the Settings gear icon > Scroll down and select User Profile > Confirm the "Wrist" section is reflecting the wrist the S70 is being worn on during sessions.
Make sure to wear the watch on your lead wrist, so if using right-handed clubs...the watch should be worn on the left wrist (User Profile > Wrist > Should = Left). If using left handed clubs, the watch should be worn on the right wrist (User Profile > Wrist > Should = Right).
Complete a full swing while using the tempo training app. Considering and following all of the above should ensure that your swings are being detected during Swing Tempo sessions.
I recommend contacting Garmin Support to discuss this live with an expert, so our team can get more info from you to determine the cause of the concern.
