Brady Exxplains The Kinetic Chain

[Limpinhitter]

I think the torso should uncoil ahead of the hitting arm, decelerate, and transfer the energy to the lagging hitting arm.

Below the arm and torso rotate forward together, without much lag, thereby creating a leak in the chain, and leaving some power on the table.

Do you agree?

Ideally, you have time to plant your feet and set up, and you initiate the forward swing and the kinetic chain with hip rotation and the chain of events continues from there.

 

[Raul_SJ]

Arm rotation is the last link in the kinetic chain of the ATP style fh. You are correct that the Macci flip is not found in every forehand. But, It is found in the World's best forehands.

I think the last link is the wrist. Federer moves from an extended wrist position (laid back wrist) towards neutral wrist position at contact (wrist flexion).

This may be a passive wrist movement but I do not think The Kinetic Chain distinguishes between active and passive movements within the chain.

 

[ByeByePoly]

I think the last link is the wrist. Federer moves from an extended wrist position (laid back wrist) towards neutral wrist position at contact (wrist flexion).

This may be a passive wrist movement but I do not think The Kinetic Chain distinguishes between active and passive movements within the chain.

The arm rotation and the extension release are both delivered through hand at contact. One is a wrist movement (extension release) and one is hand rotation with the arm. You might have to get the stop watch out for this one.

FYI ... @Limpinhitter will not acknowledge Fed's extension release based on painful previous posts.

 

[Limpinhitter]

The arm rotation and the extension release are both delivered through hand at contact. One is a wrist movement (extension release) and one is hand rotation with the arm. You might have to get the stop watch out for this one.

FYI ... @Limpinhitter will not acknowledge Fed's extension release based on painful previous posts.

Wut?

 

[ByeByePoly]

Wut?

Wut's UP!!!

 

[Raul_SJ]

The arm rotation and the extension release are both delivered through hand at contact. One is a wrist movement (extension release) and one is hand rotation with the arm. You might have to get the stop watch out for this one.

FYI ... @Limpinhitter will not acknowledge Fed's extension release based on painful previous posts.

That cannot be in dispute. The wrist is in extension and must be released. It's the perfect example of Stretch Shortening Cycle and release of energy.

The more I think about it, the more I am convinced the wrist is the last link in the chain. Or perhaps simultaneous with the ISR/Pronation. But don't know if The Kinetic Chain model allows for simultaneous contributions.

Also, since the The Kinetic Chain model states everything starts from the ground, then it naturally follows that it all ends with the wrist.

 

[ByeByePoly]

That cannot be in dispute. The wrist is in extension and must be released. It's the perfect example of Stretch Shortening Cycle and release of energy.

The more I think about it, the more I am convinced the wrist is the last link in the chain. Or perhaps simultaneous with the ISR/Pronation. But don't know if The Kinetic Chain model allows for simultaneous contributions.

Also, since the The Kinetic Chain model states everything starts from the ground, then it naturally follows that it all ends with the wrist.

I forgot to mention Fed seems to vary the extension at contact, and not just stretched running to his right. To me he has his hand still laid back pretty far often. No idea how he does that with a Eastern grip.

 

[FiReFTW]

I forgot to mention Fed seems to vary the extension at contact, and not just stretched running to his right. To me he has his hand still laid back pretty far often. No idea how he does that with a Eastern grip.

Extension naturaly happens, if he hits CC the timing of the swing will be a bit later hence more extension than going down the line, but its all about timing here.
It happens naturaly tho, they dont think about actively extending the wrist that is laid back, it snaps forward naturaly, and also the rotation of the shoulder happens, brushing the racquet upwards (windshield wiper).

If you do shadow swings and have a rly relaxed arm and swing slowly but still using the kinetic chain ul notice the wrist snaps forward at one point and the rqcquet also starts rotating upward from the pre stretched muscles and releasing of them.

 

[mad dog1]

I forgot to mention Fed seems to vary the extension at contact, and not just stretched running to his right. To me he has his hand still laid back pretty far often. No idea how he does that with a Eastern grip.

It’s a strong eastern and not a pure eastern grip so it’s between the eastern and sw. Plus I’m sure he has a pretty rigorous stretching protocol for his hands, wrists and forearms.

 

[ByeByePoly]

Extension naturaly happens, if he hits CC the timing of the swing will be a bit later hence more extension than going down the line, but its all about timing here.
It happens naturaly tho, they dont think about actively extending the wrist that is laid back, it snaps forward naturaly, and also the rotation of the shoulder happens, brushing the racquet upwards (windshield wiper).

If you do shadow swings and have a rly relaxed arm and swing slowly but still using the kinetic chain ul notice the wrist snaps forward at one point and the rqcquet also starts rotating upward from the pre stretched muscles and releasing of them.

That all sounds right, but not really my point. Looking at Fed at contact, sometimes it looks like he has released very little extension ... almost like he maintained his laid back wrist all the way to contact. Really hard to quantify extension release watching video. My other point was with an Eastern, it's amazing to me he can hit that far in front with that laid back of a wrist.

 

[ByeByePoly]

It’s a strong eastern and not a pure eastern grip so it’s between the eastern and sw. Plus I’m sure he has a pretty rigorous stretching protocol for his hands, wrists and forearms.

Yeah ... think it goes without saying his wrist flexibility should not be attempted by us. I was reviewing my fh grip, and was going to start a thread about contact points for different grips. The 3rd bevel (eastern) is a bigger bevel, at least on my racquet. When we say we hit an Eastern, that can have a fairly big range. It turns out ... using the opposite of your term "strong", I hit a "weak" eastern. My index finger knuckle is at the top of bevel 3 near 2. Basically split the distance between continenal and eastern.

 

[FiReFTW]

That all sounds right, but not really my point. Looking at Fed at contact, sometimes it looks like he has released very little extension ... almost like he maintained his laid back wrist all the way to contact. Really hard to quantify extension release watching video. My other point was with an Eastern, it's amazing to me he can hit that far in front with that laid back of a wrist.

Maybe urs looks similar but you don't know it, you should video tape yourself to see.