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Edit: Shit I forgot to say, the dude doing these has the 400m hurdles WR i think

Comment I wrote :

He is able to focus on the middle/upper RoM (more specific for sprints), applying more force there, because the bar bouncing does most of the work for the lower RoM. I think the weight also begins to decelerate at the uppermost RoM, so more force has to be generated at the RoM where he is the strongest. Its more specific for sprint power than jump squats or hang power cleans because he can do the reps in quicker succession.

I think this lift is likely amazing for track speed, maybe even acceleration in sports. The way the overload is different at the bottom, middle and top of the lift I believe might have a higher carryover for speed than any other lift i can think of (belt squat might be similar)
While this movement itself would be pretty tough to set up, this really inspires me to experiment with band tensions (somewhat similar to this), there might be some potential for carryover to athletic movement. I do remember Kelly Baggett saying they were pretty taxing on the CNS though

Not sure what you mean. You train at around 30% 1RM for max power, and at 80% 1RM on the other end of the FV curve to recruit high threshold motor units. Both are necessary. IMO, While the movement speed being similar to sport can be an important thing for specificity, it is just one of many factors for carryover. IMO, At the very least the specificity of this movement would be higher if used in something like a french contast.

Anyway it looks like based on the rep range the training may have to do with both power and local endurance, but its tough to say. The TUT  is kind of low for each rep, so maybe the recommended 2-3 reps for training at 80% 1RM are more stretched out in this movement.

Its not unheard of for high level sprinters to perform something like heavy squats, even though something like a full squat is a lot less specific to sprinting than this. I believe this has the potential to overload certain areas you cant do with sprinting alone or most other lifts.
And I wouldnt exactly call this lift slow, it fits well within that zone of 80% or less I mentioned. 55-80% lifting and 80-87% lifting are used in different blocks in the Triphasic Training manual for training athletes by Cal Dietz, which is a reputable source

Yeah that machine is awesome. Su is definitely someone to study as far as joining lifting and speed work. I feel like with attempting to make lifts specific its pretty hit or miss, maybe some of the criteria for specificity are met really well while others are so far from the movement its use becomes really limited. And understanding and applying the structural change component is pretty tough as well.

But I think the upper 1/8 of a squat is potentially so difficult to maximally overload, the leverage is so good, that for an elite speed athlete, maybe even a leg press would be maxed out before approaching overloading the 1/8 RoM. In my mind thats the potential magic of a very well set up variation of this lift - tension generated earlier in the lift, but max force having to be applied at the very top due to the bar bounce no longer assisting at that RoM. But even if my theory is right, getting the loading and height correct, mastering technique and having to probably make adjustments to avoid injury, more likely than not it would be pretty impractical.

Looks just like a belt squat

It seems to be a way of loading the eccentric and concentric movement, as he puts effort into the pull and then the push, try and create rapid contraction eccentric and concentric as rapidly as possible. Recruit motor units and develop quickness in that short movement. Aim is to maintain the pendulum like movement else if not enough force placed downwards, the height will start to reduce until not possible to lift up anymore as is very heavy.

Well modern Keiser machines have > gravity eccentric loads, and so do those flywheel spinning disc machines, like Kbox, where the harder you do the cocentric, the more the eccentric pulls back at you

Well modern Keiser machines have > gravity eccentric loads, and so do those flywheel spinning disc machines, like Kbox, where the harder you do the cocentric, the more the eccentric pulls back at you

Dang I didnt see this post, but i see what you mean, didnt realize thats how those machines work. That does seem super practical. Shame those machines are kind of rare. Yeah I can imagine a machine like that being able to be custom programmed to different loads at whatever RoM and timing at some point in the future.

Not trying to be argumentative, just attempting to further the discussion, but I wonder how much and what type of carryover is gained and lost with more machine type exercises vs free weights where balance is a factor. Like why is the back squat so popular vs a smith machine squat. That seems like a pretty basic and too broad to answer clearly discussion topic, but I was thinking it might have to do with more variability in the BS.

So like in a jump theres a lot of slight variations in technique every single  jump, and if some variations get pushed to extremes they might have traumatic injury risk, so the GTO inhibits power production to account for the possibility of injury. And Im guessing a back squat also has more of these possible slight unintenional variations, which might help prepare for those variations in jumping scenarios, while a smith machine squat is so much more consistent that it doesn't.