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A common misnomer and mixup, this one is a mixture of misnaming and mix-up. In this case, however, rather than sticking points and weak links being confused themselves, it is their RELATIONSHIP that is confused.
All this leads to an analysis of lifts based on muscular contributions at certain portions of the lift: an approach that sometimes has merits but creates false assumptions about what sticking points are versus what biomechanical weak links are.
Sticking Points
A sticking point, first of all, is not a point. It is the region of a lift that is, basically, the most difficult or strenuous and where one is most likely to fail on a chronic basis. This difficult place in the lift is created by the inherent strength curve of the lift and not a muscle group supposed to be working at that time in the lift. So the sticking point for any given lift never changes. It is inherent for that lift and is created by the lack of mechanical advantage at that point.
See: Muscle Force Components pdf, Mechanics of Exericise, and Angle of Pull at ExRx
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Many trainers and fitness writers choose to theorize that a sticking point is either caused by the mechanical disadvantage OR by a weak link. I think that this is likely to be imprecise and cause more confusion than good.
What these trainers miss is that a sticking point can occur even at a region where the torque is at a very high capability in the strength curve. You can be at your strongest but if the magnitude of resistance is greater it is a simple question of mathematics. Clearly though, hammering away at “strengthening” a weak link which is actually not weak at all may not always be the answer. Hence an emphasis on acceleration and explosion.
But these questions are not the same at all for lifts that are more linear such as bench press and squats. The resistance is simply the weight of the barbell. Since the movement is linear this resistance doesn’t change. The force needed to move the barbell, then, is based on it’s velocity. When velocity is zero a higher force input is needed to accelerate the bar than to accelerate it or keep it moving at a constant velocity. Towards the top of the bench press it actually takes a force input less than the weight of the bar to lock out. Kinda neat, don't you think?
Keep in mind that linear doesn’t always mean straight. It simply means that the bar travels in a line. That line can be rectilinear (most of the time, fyi, when we mean rectilinear we say linear for short). But the movement of different body segments is always rotational. So it is the mechanical advantage at all the different joint angles that give rise to a sticking point.
So if technique remains constant and the length of the body segments is not changing then the sticking point does not change.
Weak Links
Unlike sticking points, weak links always correlate to "weak points" in a lift. Are we getting the difference here? You can be strong at a certain portion of a lift but the mechanical disadvantage at that point makes it the most strenuous part of the lift, thus the sticking point. Whereas weak links are actual muscular deficiencies that not only create a "sticking point" but that sticking point is created because of weakness and not because of an innate mechanical disadvantage.
Weak links can be many different things and unlike sticking points, they change and evolve over time and as a results it is quite possible to fail at different points of a lift. Although it seems that the most common sticking point of the bench press is somewhere around midpoint many lifters may fail right after lift off. So they surmise this is a sticking point.
An example would be a deadlifter whose body type gave him a sticking point in the region just before the knees (which is somewhere around the most common SP for conventional deadlifts). But this lifter is having trouble locking out his deadlifts because of lazy glutes. He can't get the hip thrust he needs and tends to finish with hyper extension of the lumbar. There are a host of deficiencies that come with it but his "weak point" is the lockout. His "sticking point", when healthy and functional is just below the knees.
If you are like me you may not always fail at the same exact point. But the way many trainers simply equate the sticking point with failure will have you considering a new “sticking point” every time you turn around!
How do we resolve this? Well, notice above that I said you are most likely to fail at a sticking point on a CHRONIC basis? Very important difference between what happens chronically over a lifting career and what is happening at ANY GIVEN POINT. A sticking point is not ALWAYS a failure point. It is just the most strenuous point. On the other hand, a point of failure is not always the most strenuous point of a lift, i.e. the sticking point.
Many times this distinction will prove to be semantic. It simply will not matter what you call it you just need to know how to get past it. But keeping this difference in the back of your mind can help you understand the right approach to take with different points of failure on a lift, as opposed to its sticking point.
I do think that the body part perspective and the sticking point perspective have equal merit. I simply choose to separate "weak points" from "sticking points" in organizing training.
Many times as well what seems to be a weak link can turn out to be weak technique. So never overlook the importance of a perfect setup and continued work on technique.
Mike Robertson gives some great pointers in 5 Guaranteed ways to Break Through Plateaus
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