In fantasy football, the Flex position is an extra roster spot in the starting lineup that allows for more variance in how fantasy managers build their rosters. It is a position that accepts various positions depending on your leagues rules, most commonly including running backs, wide receivers, and tight ends. The purpose of the Flex position is to allow more flexibility in how fantasy managers build their rosters, and it increases the skill of roster construction and creates more diverse rosters. Different leagues have different types of Flex positions to choose from, but the standard Flex allows fantasy managers to start a running back, wide receiver, or tight end. The best positions to usually flex are the running backs and wide receivers. Drafting players for the Flex position takes a little bit of strategy, and you want to get value, but it can be difficult because the player can easily change from week to week as you figure out what skill player is giving you the most value from your bench by racking up solid fantasy points when inserted into the Flex position.