I want an Android app that does this: samples my location data at a regular interval (that I define) and posts it to an URL (that I also define). I run a lot and would prefer to track my own runs vs having my data live on RunKeeeper or wherever.
Unless you’re looking to share location with others as you run - in which case your request makes sense.
Would OwnTracks meet your requirements? https://owntracks.org/
As to why not buy a running watch: I already have a smartphone.
OwnTracks seems to cover my use case, but has a lot of unnecessary features built in. I can probably use that.