Other procedures to Do[] something once?

Questions
1

Are there other ways to Do something once without additional overhead? Here’s a short example, but I have instances with dozens of lines of code.

If[overwriteBrightBandsPlot,
  Do[
   Export[brightBandsPlotPNGfile, LPXH2];
   Print["Wrote LPXH2 to ", brightBandsPlotPNGfile];
   Print[];
   {},
   1]
  ];

I see that Block and Module support a procedure but they also create Temporary entities.

2

If[overwriteBrightBandsPlot,
Export[brightBandsPlotPNGfile, LPXH2];
Print["Wrote LPXH2 to ", brightBandsPlotPNGfile];
Print;
];

Should work as you think…