I’m really struggling that my new Apple Watch isn’t recording my exercise activity.

I’m having a problem with my brand new watch as it’s not recording my exercise activity. I’ve gone through several steps in the settings and re-calibrated and it’s still not working so the whole reason why I purchased this watch was because the last watch wasn’t recording my activity, but that one was from a long time ago so I didn’t have a problem buying a new watch, but I don’t want one that isn’t working for my needs. I am trying to record my exercise activity and this watch Has only recorded the activity one day.