The plank is a hold rather than a rep count. The clock runs while your body line holds and stops when it breaks, so the number is time under a standard, not time on the floor.
There are no published percentile norms for the plank in the general adult population, so this hold gets no percentile. The only percentile paper is a few hundred college students with no age bands, which is not a population. What does exist is published military standards, so your time is read against those instead.
The standards below are pass marks written for a named group, not percentiles for the general population. Clearing 1:10 means you met the US Marine Corps PFT plank minimum, and nothing more than that.
| Standard | Minimum | Maximum | Who it applies to |
|---|---|---|---|
| US Marine Corps PFT plank | 1:10 | 3:45 | All ages and sexes |
| US Army AFT plank | 1:30 | 3:40 | Ages 17-21 |
Pass marks for the group each test was written for. Not percentiles, and not a rank among adults.
USMC Physical Fitness Test (PFT), plank
Plank benchmarks. A benchmark, never a percentile basis. Age- and sex-neutral: the same two hold times apply to everybody who takes the test.
US Army Fitness Test (AFT), plank
Plank benchmarks. A benchmark, never a percentile basis. Only the 17-21 age band is recorded here; the other bands exist and are deliberately NOT reproduced, because we could not verify them.
There are no published percentile norms for the plank in the general adult population, so this hold gets no percentile. The only percentile paper is a few hundred college students with no age bands, which is not a population. What does exist is published military standards, so your time is read against those instead. US Marine Corps PFT plank: 1:10 minimum, 3:45 maximum. US Army AFT plank: 1:30 minimum, 3:40 maximum.
Because there is no credible one to publish. The only percentile paper for the plank is a few hundred college students with no age bands, which is not a population you can rank an adult against. Inventing a curve to fill the gap is the exact thing this site exists to call out, so the plank carries published standards instead.
3:45 is the maximum score on the US Marine Corps PFT plank, so holding it means you top out that test. It is not a percentile: nobody has published where that time sits among adults generally.