My activity icon is gone how do I get it back?

Using the Watch, open the App Store and search "Activity".

When you find Activity, does it say "Open" or does it say "Get"?

If it says "Open", then it must still be on the watch.

If it says "Get", then it must have got deleted. Click "Get" to reinstall it.

Hopefully this steers you in the right direction ;-)

This step did not help. Any other suggestions? I did the first software Update and afterwards, my Activity reports were wiped out. When I access the AP store nothing is showing regarding Activities. I can no longer see my steps, etc.

It is not possible to delete the Activity app so there may be nothing in App Store.

Press the digital crown

Tap and hold the screen

Tap List View

It will be the first app on the list

Change back to grid view if that is your preference.

You say "my" activities yet the watch is your son's? I am confused.

I would power off the Watch, power off the iPjone, then turn it on again followed by the Watch.

If that does not work unpair the Watch and pair it again as a family watch.