Gains genetic or related to other factors
Long has raged the discussion concering whether the variation in peoples gains are due in main to genetics or to differences in the way people perform exercises/how often they exercise/how in tune they are with their cock etc…
It occurs to me that this can be tested. Gains from jelqing/squeezes are fundamentally different from gains achieved by stretching/hanging. They are different at a phyiological level- on the one hand the soft tissue of the penis is being stressed/grown/expanded while on the other the ligs are being stretched. There is no reason to believe that someone posessing a genetic advantage for one form of gains should posess the same advantage for the other, they are genetically independent.
Next we can say that girth gains are primarily from jelqing/squeezing while length gains are mainly from stretching/hanging (not 100% true but reflects the trend). We should also assume that individuals are equally as ‘good’ at performing length exercises as they are at girth exercises.
If the main factor in what people can achieve by way of gains is genetics then there should be little correlation between length and girth gains- ie loads of long thinner dicks and short thicker ones. If however exercise factors are more important, then girth gains should more often tally with length gains.
Having scanned the stats page (no statistical tests though) my gut feeling is that genetics are the overriding factor.