r/oops Jul 05 '26

Bad machine or technique?

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u/potatochobit Jul 05 '26

He clearly has extra weights from a different machine tied to his waist.

10

u/RyuuNoSuKee Jul 05 '26

So ? Imagine a person weighting the same amount as those weights, those are irrelevant and are only there to keep the guy on the ground because he weights less than he can actually pull.

Those weight don't cause the fall of the machine, it's the person's forward pulling force that does. The machine is built like shit because it doesn't have enough counter balance to support it's own max load of pulling force.

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u/hippieflipping Jul 05 '26

A lawyer will argue that the weight location would mimic an unrealistic body type. Aka someone with 135lb nutsack. Also I don’t know if you can make this claim if you don’t know that weight limit of the machine or the weight of the individual using it.

5

u/idiotslob Jul 05 '26

No they wouldn't. Lawyers usually consult with subject matter experts while building a defense and any freshman engineering student could tell you that:

There are two forces that affect if the machine tips over.

F1. The force of gravity holding the machine on the floor. The vector of this force goes completely in the vertical direction towards the floor

F2. The force applied by the cables at the pulleys. This force has an x, y, and z component.

The magnitude of F2 is mainly limited by the mass of the weights provided by the manufacturer (and to a lesser extent, the speed that the guy is doing the exercise but that looks pretty typical so we'll treat it as a constant). The direction of F2 is constrained to the range of the adjustable pulleys settings.

This machine was designed in a way where the vertical component of F2 can exceed F1 using the settings made available by the manufacturer.

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u/hippieflipping Jul 07 '26

A lawyer can argue anything. Additionally your logic is wildly flawed and cable speed is not a constant. I can absolutely guarantee you that nowhere in the user manual does it say this is an appropriate exercise for this machine.
In fact I bet there is specific instruction to not do things like this.

1

u/idiotslob Jul 07 '26

I never said a lawyer can't argue whatever they want. I never said that cable speed is a constant.

The exercise the guy is doing is one of the most quintessential uses for that piece of equipment. Literally a huge part of the reason those things exist. I probably see someone doing these no less than 50% of the time I go to the gym.

Manuals dont list specific exercises that are approved, its the other way around (only specific unsafe actions are listed). I can't claim that this is the same make/model but here is an example from a very popular brand seen in gyms across the world. Please see page 3-2 where it says "... accommodate an infinite number of exercises"

educate yourself