Just the norm for International players although Belgium seems to do it particularly well. The emphasis is on ball skills and passing and less on developing athletic one on one skills. I remember Makurat saying the kind of physical training that UConn expects is not the norm in international teams and is the biggest difference she has experienced. So they are not trying the build world class athletes as much as developing team play.
I spent a lot of time in Belgium on business 20+ years ago. Basketball is incredibly popular. There are club teams and rec leagues everywhere. A number of colleagues I worked with played basketball every Wednesday night. I joined them on several occasions and was quite impressed with their skill levels.
The best thing about a bunch of guys playing basketball after work in Belgium is that afterwards everyone heads to a nearby establishment to drink beer, and the Belgians make the best beer in the world.
Don't forget Belgium's "low-country" neighbor, The Netherlands, also produces some excellent hoopsters (and a few excellent beers, too!). Center Emese Hof and guard Laura Cornelius had excellent careers at Katie Meier's U of Miami team. Per eebmg's point, Meier thought so much of that, she has a French guard and Swedish guard/forward on this year's roster.
Oldude: My daughter spent a semester abroad at University of East Anglia in Norwich, England, just across the North Sea from Belgium and there were a lot of Belgium pubs there. I enjoyed myself immensely at one or two of them for an extended lunch!
Getting back to Belgium, I noticed the Massey sisters are 19. I wonder if they are club "professionals" already and/or eligible to play on a collegiate level. At 6'1", don't know if they'd have similar impact day-in or day-out, but those technical skills could go a long way at certain schools that stress ball distribution.