How to update my weight in the Activity app

Solution 1:

The Activity app uses the info stored in the Health app.

To change your weight:

1. Open the Watch app on the iPhone
2. On the My Watch tab, scroll down and tap on Health
3. Tap Edit in the top right corner
4. Scroll through the weights and select the correct one

You can also do this on the iPhone in the Health app under Body Measurements.

Once that is done, Activity will use the updated value.

Solution 2:

In addition to fsb's correct answer, I've used Workflow to create a widget that allows me to update my weight more quickly than drilling down into the health app (since that app always launches in the last position I left it and I use it for other things, I always found it to be 3 or 4 taps before being able to enter my weight.)

There are other apps I've used in the past:

Lose It!

and

Scelta

both give easier access to adjusting your weight if you want to keep it current.