What is that even supposed to mean? There's no evidence for any significant variation in physical strength between the castes when other factors (nutrition etc) are equalized. The British labelled certain ethnicities as "martial races" (Sikhs, Pashtuns, Rajputs, Dogras etc) but that was mostly political and based on crude stereotypes, instead of statistical studies. It is indeed true that ethnicities like Rajputs and Sikhs have had stronger martial traditions historically and hence have acquired an image of ferocity but that doesn't say anything about individual physical strength.
Also there's no such thing as "true rajput blood" jfl. There's shit ton of variation between rajputs of different regions, in fact the Rajput identity itself was historically a label rulers and nobles of varying backgrounds adopted for legitimacy. A rajput from Punjab is genetically much closer to Jats and Khatris than he is to some rajput in Jharkhand for example.
There are height differences, skin colour differences among different subgroups of Indian peoples. Denying that is denying reality. Now whether that neatly transposes to caste is another matter.
In my opinion, Brahmin caste do seem to have different statistical averages on education attainment and IQ than every other Indian subgroup. If you see an Indian in MIT or doing well in any of the olympiads like IMO, IOI, InPho, generally they are a Brahmin and I’ve seen enough to convince myself that it’s genetic.
When it comes to skin color, things get tricky. For sure a Kashmiri Brahmin like Indias first Prime Minister is probably going to be a Fitzpatrick 3, quite rare among Indians, almost white passing (the sub tones are never pink though unlike Europeans), but a Tamil Brahmin like Sundar Pichai is a Fitz Patrick 4 closer to 5. I have also seen Brahmins with a FitzPatrick 5, like chess player Pragnanandha or Kash Patel (Kash is not Brahmin but his skin color is obviously a 5).
This just shows that Brahmin as a subcategory is not a good predictor of skin color but still a good predictor of IQ. For skin color, which part of India also needs to be known, and even that sometimes is not enough, since I have met South Indian Brahmins (who trace their family for generations to the south) who are a FitzPatrick 3 and btw FitzPatrick 3 is the lightest I’ve seen in India. Anything lighter is probably European ancestry mixed in.
Another thing I suspect but I don’t have data for is that good looking faces are more prevalent in North Indian Rajputs. Hrithik Roshan is a prime example, Kiara Advani is another. In South good looking faces are harder to come by, but Rana Duggabati , and Vijay Devrakonda are probably Chad lites. They are also Kshatriyas.
TLDR: There are caste differences among Indian groups, especially since inter caste marriage has been historically rare.
