My watch is vibrating every 30 seconds during a workout. How do I shut this off?

Good day to you DHatjr, 

Any ideas what your Apple Watch is vibrating to notify you about? Often if we can pinpoint that, it’s easier to disable the feature or isolate an issue. Which workout type are you using? 

For example, when you use a run or walk workout, your Apple Watch taps you every mile or kilometer, and it shows you an update on the display. If you're cycling, your Apple Watch taps you every five miles or kilometers instead.

Use the Workout app on your Apple Watch

Depending on what you’re being notified of, you may find a Focus to be a good option.You can even create a Focus specifically for working out to allow specific notifications/contacts through, while silencing others - Use Focus on Apple Watch

Create your own Focus

1. On your iPhone, go to Settings > Focus.

2. Tap the plus sign, choose a Focus, then follow the onscreen instructions.

If you create a custom focus, you can choose a color and an icon to represent it, and enter a name for it.

Thanks.