double back on oneself

So you have to you're just doubling back on yourselves.

One of the nicest things about walking around coastline peninsulas is that it is often easy to stick to the coastline without doubling back on yourself at the end.

And somewhere along the line, according to legend, the geodesies took weird shortcuts and closed up "timelike loops," causing you to double back on yourself, or do something even more outrageous.

In the pretty town of Marlow, you'll need to double back on yourself, crossing the river before heading east on the A404, then turning off into country lanes to get to Hurley.

You can double back on yourself or move from a numbered block to a normal one without penalty - the numbered one remains if you need to return to it (and you will).