The spelling of the word "FLEXTO" follows the standard English phonetic rules. The pronunciation is represented by the IPA transcription of /ˈflɛkstoʊ/. The initial "F" sound is followed by the short "E" sound, then "L" sound, the "EX" sound, and the short "O" sound. The final sound "TO" is pronounced with a long "O" sound. This word is commonly used in the context of fitness and exercise, referring to stretching and flexing muscles.