What is a Flex Position?
FLEX stands for "flexible." It's a roster spot where you can start a player from multiple positions.
In most leagues, your FLEX spot can be filled by a RB, WR, or TE. It gives you more options for your starting lineup.
Think of it like a wildcard slot. Instead of being forced to start 2 RBs and 3 WRs, you get to choose your best available player for that flex spot.
Typical Roster Setup
Here's what a standard fantasy roster looks like:
1 QB - Quarterback (locked position)
2 RB - Running Backs (locked positions)
2 WR - Wide Receivers (locked positions)
1 TE - Tight End (locked position)
1 FLEX - RB/WR/TE (your choice!)
1 K - Kicker
1 DST - Defense/Special Teams
Some leagues have variations like SUPER FLEX (can start a QB) or multiple FLEX spots.
How to Use Your Flex Spot
Rule #1: Start Your Best Player
Don't overthink it. Your FLEX should be your highest-scoring available player.
Example:
You must start:
• RB1: Christian McCaffrey (stud)
• RB2: Josh Jacobs (solid RB2)
• WR1: Tyreek Hill (stud)
• WR2: CeeDee Lamb (stud)
Now you have these options for FLEX:
• RB3: Raheem Mostert (15 points projected)
• WR3: Christian Kirk (12 points projected)
• TE2: Kyle Pitts (10 points projected)
You should start: Raheem Mostert in your FLEX because he's projected highest.
Common Flex Mistakes
Mistake #1: Always Playing a RB
Don't assume RBs are always better for FLEX. Sometimes your WR3 is better than your RB3.
Mistake #2: Playing Safe Instead of Upside
If you're projected to lose by 20 points, don't play the "safe" 8-point floor guy. Swing for the fences with a boom/bust player.
Mistake #3: Never Using a TE in Flex
TEs score less on average, but if your TE2 is Travis Kelce's backup and he's out... that backup could outscore your WR4.
Mistake #4: Not Checking Game Times
Always put your Thursday/early Sunday players in the RB/WR slots, NOT the Flex. Save Flex for Sunday afternoon/night games. This gives you more flexibility if someone gets injured.
Pro Strategy: Flex Game Time Management
This is an advanced tip that beginners should know:
DON'T do this:
Put your Thursday night RB in your FLEX spot. Game locks Thursday.
DO this:
Put Thursday's RB in your RB2 slot. Put your Sunday afternoon RB in FLEX.
Why?
If one of your Sunday morning players gets injured in warmups, and you still have a flex spot open for an afternoon game, you have more options to replace him. You can grab any RB, WR, or TE playing later that day.
If you locked your FLEX on Thursday, you can only replace the injured player with the same position.
When to Start a TE in Your Flex
Most of the time? Never. TEs score less than RBs and WRs.
EXCEPT when:
• You have an elite TE (Travis Kelce, Mark Andrews) and a mediocre WR3/RB3
• Your TE has a great matchup against a terrible defense
• Injuries/bye weeks have wrecked your RB/WR depth
Example:
Would you rather start:
• Travis Kelce vs BAL (projected 14 points)
• Dontrell Hilliard vs KC (projected 8 points)
Obviously start Kelce in the FLEX.
Key Takeaways
✅ FLEX = Flexible spot for RB/WR/TE
✅ Start your highest projected scorer
✅ Save FLEX for late games when possible
✅ TEs in FLEX are usually bad, but not always
✅ When in doubt, play the better player
That's it! FLEX isn't complicated. Just think of it as "my 3rd best RB/WR" and you'll be fine.