IMO, most of their issues come from their absolutely horrific culture, parenting and low protein high carb diet. I go to the gym most day's and it's rare to see a Jeet who can bench a single plate for reps. I've seen many groups of Jeet men in jeans and polo shirts take turns doing feat's of strength type contests where the winner is about average strength for a non-Jeet 14 year old.
Are they Inferior? on average, absolutely. However I think it's more nurture vs nature. This can be easily seen when looking at the 3rd, 4th generation types raised abroad that have abandoned all Indian culture.
Indian culture is all about cutting corners, scamming, reaffirming delusions of Indian supremacy and putting in the bare-minimum so it's no surprise they physically manifest as such.
That being said, the world Cricket championship final is currently on going against South Africa, and if India wins be prepared for a flood of Jeets unironically claiming they are athletically superior.