Apple Watch Apps Not Installing Spinning. I do most of my restarts this way when things are acting up. Delete app from apple watch;
Restart the iphone by holding down the home button and wake/sleep buttons. If this doesn't solve the syncing issues between your apple watch and iphone, you can remove the apple watch, and try setting it up again. But in some instances, tapping this button results in a spinning icon with a stop icon in the middle, but it never stops spinning and never installs the app.
Apple provides several tips to help you get the most out of your iphone's battery which you can find here:
Apps won't download and install. Wait for some time until the app can uninstall. I just get a spinning wheel. When going through the available apps section in the watch app, you can tap the install button to get more apps on your wrist.