Don't have the link at hand but our local board had a big "debate" about the zig zagging.
In tests it has been shown to actually decrease tire heat rather than helping. It's nothing more than a personal routine and serves no real purpose in warming up the tires despite what everyone will tell you.
I don't do anything special. I take it easy for the first few and move myself around a bit so
I'm warmed up. Other than that it's business as usual and I've never had issues.