Chad Brown and Training Turf Horses?

[Tavasco]

Trainer Chad Brown is known for how well his turf runners perform. Does anyone have any theories on why that is? Was this phenomenon also common to Bobby Frankel?

Does one use specific training techniques with grass horses? For instance, lots of long-distance stamina runs followed by uphill wind sprints or something unusual.

Or, is it all about breeding and pedigree?