Why Soccer Players, Fencers, and Traders Are All "Testo Type" — Research on 2D:4D and Performance

The folk idea that "people with longer ring fingers are better at sports" has, surprisingly, been a serious scientific research topic for over two decades. Studies have consistently reported that people with lower 2D:4D ratios — where the ring finger is relatively longer than the index finger — tend to perform better in specific sports and professions. This article walks through the research across soccer, fencing, basketball, long-distance running, and even financial trading. And it carefully separates what these studies actually say from what they don't.

1. Why Would 2D:4D Relate to Athletic Performance?

The basic hypothesis is simple. A lower 2D:4D signals higher prenatal testosterone exposure, and prenatal androgens are theorized to shape the cardiorespiratory system, musculoskeletal development, spatial cognition, and competitive drive. Importantly, this has nothing to do with adult testosterone levels (see our separate article on that). 2D:4D captures only the prenatal setpoint.

2. Endurance: The VO2max Correlation

The 2025 meta-analysis by Gower et al. is the largest evidence to date in this area. Pooling 5,293 participants across 22 studies, the analysis confirmed a statistically significant negative correlation between 2D:4D and VO2max. In other words, lower finger ratios correspond to higher aerobic capacity.

The effect size itself is modest — correlation coefficients typically fall in the r = -0.15 to -0.25 range. This doesn't mean "you can predict VO2max from 2D:4D alone"; it means a weak but consistent group-level tendency exists.

3. Soccer: Differences Among Elite Players

A study of 133 professional soccer players reported an unusually large correlation of r = -0.65 — far above what general-population studies typically find. Taken together with similar reports:

• International-level players have lower average 2D:4D than lower-league players
• Within the same team, players with more minutes tend to have lower ratios
• No consistent difference has been found between attacking and defensive positions

Caveat: elite athlete samples differ from general populations, and effect sizes can be inflated. Small samples also amplify publication bias.

4. Fencing and Basketball: Sport-Specific Patterns

Fencing: International rankings correlate significantly with 2D:4D. Fencing demands spatial cognition, snap judgment, and competitive focus — three traits that have all been linked to prenatal androgens.

Basketball: Studies of pro players have found significant correlations between lower 2D:4D and offensive stats (scoring, assists). Interestingly, these correlations disappear for metrics less tied to competitive pressure, like free-throw percentage. This suggests 2D:4D relates more to performance under competitive pressure than to pure skill.

5. Long-Distance Running: Stronger at Longer Distances

Manning and Taylor analyzed 241 British marathon runners and found a clear negative correlation between finishing times and 2D:4D. The striking detail: the correlation grows with distance. It's weak or absent in 100m sprinters but relatively strong in marathoners. This points at an effect on endurance systems rather than raw power.

6. The Unexpected Domain: Financial Trading

One of the most famous studies in this area is Coates et al.'s 2009 PNAS paper tracking 44 high-frequency traders in London over 20 months:

• Traders with lower 2D:4D had significantly higher long-term profitability
• They were also more likely to survive longer than the industry average
• The effect grew clearer with experience (shorter observation windows missed it)

The authors interpreted this as a combination of risk-taking and quick reaction. But 44 is a small sample, and the result has not yet been replicated at scale.

7. What These Studies Actually Say — and What They Don't

What they say:

• At the group level, weak but consistent correlations exist between 2D:4D and certain competitive or endurance-related metrics
• These correlations survive multiple meta-analyses, so they're unlikely to be pure chance
• Effects tend to be larger in elite samples

What they don't say:

• "People with low 2D:4D are definitely athletic" — individual-level predictive power is very weak
• "You should pick a career based on your 2D:4D" — environment, training, and opportunity matter far more
• "Your adult testosterone is high" — 2D:4D is independent of adult hormone levels

This distinction matters. In sports science, 2D:4D is an interesting research topic but not a selection tool. Some researchers have proposed using 2D:4D in youth soccer scouting, but the academic consensus is skeptical — individual-level predictive power just isn't strong enough.

8. Conclusion

Soccer, fencing, basketball, long-distance running, and financial trading — what they share is a demand for focus under pressure, fast judgment, and endurance. The finding that 2D:4D weakly correlates with these traits is reasonably robust. But that correlation is a window onto group-level statistical tendencies, not a predictor of your individual future.

Having a low 2D:4D doesn't make you Pelé, and having a high one doesn't mean you can't run. Take your number as one small piece of self-curiosity, not a verdict.

References

• Gower B et al. (2025). The Relationship Between Digit Ratio (2D:4D) and Aspects of Cardiorespiratory Fitness. American Journal of Human Biology, 37(4).
• Coates JM, Gurnell M, Rustichini A (2009). Second-to-fourth digit ratio predicts success among high-frequency financial traders. PNAS, 106(2), 623-628.
• Manning JT, Taylor RP (2001). Second to fourth digit ratio and male ability in sport. Evolution and Human Behavior, 22(1), 61-69.