Exercise execution is so underrated.
Just becuase it's written in a book that this movement will target a specific muscle, doesn't mean that you are optimally targeting a muscle.
Our bodies are built to transfer loads throughout the whole body. Using one muscle and one muscle only is weak and inefficient from an biomechanical perspective. Hence why we have a prime mover then their antagonists, synegists and fixator muscles.
Going all the way down and all the way up is pointless and a waste of time if you're unable to completely control what muscles are firing. Yes every muscle involved in allowing this movement to occur will be used! There is no true isolation of a muscle. But slowing down the movement, you can control how much each muscle fires, and how much load there is on each muscle.
Interms of how much range of motion you should use, disregarding if you had absolute control in a movement. Think where joint start to be compromised. Dips are a prime example. For me any lower than a 90 Degree angle in my elbow and i can feel my shoulders starting to roll fowards. Putting them into a compromised position. Doing a couple of reps there probably won't do much, but years of lift with disregard to your joint health will point you in the right direction to an injury. .
Train hard and smart. #longevity
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