@jeremymartin6 and @cooperwebb_17 practice their starts with an assist from @pedro129 .... @ironmanmx #Ironmanmx @promotocross @nbcsports @mavtv #ThisIsMoto #moto #motocross #MXonNBC #supercross #motorcycles #dirtbikes @starracingyamaha @yamahamotorusa @ansrmx