Lost my RUN activity.

When I downloaded and installed the ECG app on my Venu 3 (4.15), the RUN activity disappeared from my watch.  I copied the WALK activity and called it OUTDOOR RUNNING. I then modified that as much as I could to make it similar to RUN. However, it is not an ideal substitute.

Since the RUN activity is built in, there is no download for it. How can I get the original activity back?