Question about 1HBH -supination-

[LeonardKickServe]

Hello guys
I know that is not the first time I ask about this element that many great players like Henin, Kuerten, Wawrinka, Gasquet. have it in their stroke mechanism.
I try to understand the possible reasons of the supination in the Follow thru
1-It s a consequence of very a low to high moviment and a ton of racquet speed
I dont think that reason is the right one because players like Almagro never supinates

2- As I swing forward the racquet is not pronated. that is neutral(no supination no pronation) and just after the ball is hit the racquet starts supinating
I dont think that would help to impart spin because the ball has no contact with the strings anymore
Jeff Counts thinks that s the right thing
""A second element to notice is the gradual turning of the hand. The knuckles of Acasuso's hand, which face the net on contact, end up facing the right fence. This gradual and steady turn of the hand helps im.part topspin on the ball. """"

3- The last option: When I start to swing forward my racquet is pronated and then starts supinating and just finishes in the Follow Trough

I think that is the right one but It s hard to see because of the Little L structure
There are guys here that have a terrific knowlodge,so help me to unveil such mystery.
Thank you for your time

 

[LeeD]

I supinate on the 1hbh topspin backhand because it helps me close off the face of my racket every time. More on high balls, less on low balls.

 

[dozu]

when I first started developing the 1hbh, I had no forearm rotation (to keep it simple)... but I am not a natural flat ball hitter, so I am adding more and more rotation.

it's caused by the intent of the shot... flatter, more thru-the-ball action, will require less forearm rotation, while more spinny, more 'brushy' type shot will require more rotation, resulting in a supination finish.

 

[LeeD]

Good poiint.
Supinate on rallyball backhands, don't on crushing winners.
Kinda like pronate on rallyball forehands, but flatten it out for your winners.