Prop LabWeather and injury situations
Questionable Running Backs and Rushing Yards Props: A Real Lean or a Lucky Slice?
Running backs who play through a Questionable tag went under their rushing line far more often than the average back. We found it after a lot of looking, so here is the full picture, sample sizes included.
By Edgehalla ResearchPublished 6 min read
The angle: fade the banged-up back
Every week, NFL teams list injured players as Out, Doubtful or Questionable before the game. The question for prop bettors: does a running back who plays through a Questionable tag still get his usual work?
Our data says probably not. Across 2023–25, Questionable running backs who played went under their consensus rushing-yards line about 60% of the time. The average back went under roughly 53% to 54% of the time.
Before going further, one honest label. This angle came from about 100 exploratory looks at the same 2023–25 prop data. It is one of the best results from that search. Results picked from many looks almost always shrink once they are tested on new games.
What the numbers show
We used consensus lines from the major U.S. books, taken 60 minutes before kickoff, and the final pregame injury report. Props on backs who did not play are voided by the books, so every bet here is a Questionable back who suited up.
Rushing-yard unders: Questionable RBs vs every back
Win rate of the under at the consensus line
Questionable running backs went under their rushing line about 60% of the time in both periods, well above the rate for all backs.
The gap is large, around 6 to 10 points over the blind under. But look at the intervals. The 2025 range runs from 49.0% to 74.7%. With 51 bets, the true rate could plausibly be anywhere from a coin flip to a big edge.
Split by practice status
The official injury report also lists each player’s practice participation. The less a back practiced that week, the more often he went under.
Questionable RBs by practice status and spread
Rushing-yard under win rate, 2023–25 (in-sample)
Backs who were limited or missed their last practice went under more often, but the “did not practice” group is only 18 bets.
The practice pattern is the most convincing part. Full practice looks close to an ordinary back. Limited is clearly higher. Did Not Practice is highest, at 14 of 18. That ordering is what you would expect if the injury really limits the workload.
Still, 18 bets is almost nothing. Its interval runs from 54.8% to 91.0%. Do not anchor on 77.8%.
Games with a big spread, 7+ points either way, went 34 of 46. A lopsided game script can cut carries for a trailing team, or hand late carries to a backup when a team is far ahead.
Why the under might win
- Snap counts. A back playing through an injury may be held to a planned share of snaps.
- A healthier teammate. Coaches may shift carries to the backup when the starter is not 100%. Our RB Roulette tool tracks those next-man-up backs.
- Lines may not fully adjust. Books do lower lines on banged-up players. The question is whether they lower them enough, especially when the status changes late in the week.
There is also a reason for doubt. Injury reports are public, and late-week news moves lines quickly. Our line snapshot is 60 minutes before kickoff, which captures most of that news, but not all of it.
Why we are not calling it an edge
We searched the same three seasons about 100 different ways. The best result of a big search is inflated by luck almost by definition. Our multiple-testing article shows how much: in a larger search, 19 of our top 20 angles fell in the next season.
And 2025 is not a true holdout here. It was part of the data we searched. So the only result that counts is the live one, on games that had not been played when we wrote the rule.
Injury status comes from the official report first, then other feeds when it is missing. Only the official report carries practice status. In our Week 5 dry run, no running back with a line had appeared on a report yet, because the official report is not published until Wednesday through Friday.
How to use this, for props and fantasy
- Check Friday’s practice line, not just the tag. Limited and DNP mattered more than the Questionable label itself. Our injury report shows practice status for every day.
- Compare with the backup. If a capable backup is active, expect the starter’s carries to shrink.
- In fantasy, temper expectations for a Questionable back who did not practice fully, even if he plays.
- Treat this as a lean, not a system, until the live record says otherwise.
Frequently asked questions
Should I bet the under on a questionable running back?
It has been a strong lean but not a proven edge. Questionable backs who played went under their rushing line 59.7% of the time in 2023–24 (n 134) and 62.7% in 2025 (n 51). The angle was found after about 100 looks, so we are tracking it live first.
Do running backs who miss practice still get their carries?
Less often, in our data. Questionable backs whose last practice was Did Not Practice went under their rushing line 77.8% of the time, but that is only 18 bets. Limited-practice backs went under 61.9% on 113 bets.
Does limited practice matter for fantasy running backs?
It seems to. Among Questionable backs who played from 2023 to 2025, those limited in their last practice went under their rushing line 61.9% of the time, against 54.0% for backs who practiced fully.
Are props voided if a questionable player does not play?
Generally yes. Books void player props when the player is inactive, and our grading did the same. So the questionable-back results only include backs who actually played.
Should I bet rushing attempts unders on injured running backs?
We have not tested it on its own. Our live tracking logs a rush-attempts under alongside each Questionable-back rushing-yards call, so a record will build from Week 6 of 2026.
More in Weather and injury situations
Sources and method
- The Odds API (historical and live player prop lines)
- nflverse data (play-by-play, schedules, weather, injuries, combine)
- Wilson score interval
- Multiple comparisons problem
- National Council on Problem Gambling (1-800-GAMBLER)
- Responsible Gambling Council (Canada)
Research and analysis, not betting advice. Past results do not guarantee future returns; bet only what you can afford to lose.