I can't speak for others but I do all variations of pullups/chinups however I mainly use wide grip pullup, shoulder grip pullup and close grip chinup because they all do slightly different things.
Preface - Cliffs at the bottom;
I consider the pullup and chinup as having two positions, the stretch at the top (the scapula drifted upwards) and the full contraction at the bottom (scapula pulled down and or back), effective lat recruitment imo is about how you work the scapula through different range of motions. Since different grips affect shoulder and arms position and therefore scapula position, each variation will have different scapula motions and ultimately work the back differently i.e. the type of stretch at the top, the overall range of motion and contraction at the bottom will all be affected by grip and hand position. I do several variations because I don't feel like I can't cover all bases with one movement.
With the wide grip pullup you get an outward stretch of the upper lats and the Teres muscles because the scapula are being pulled away from the body (upwards and out). This is why you often hear 'wide grip for wide lats' because the stretch feels like it is pulling your upper back muscles outwards, but getting your lats wider is not that simple, although you do get a good outward stretch from wide grip what you sacrifice is a much greater range of motion because the position of your shoulders and arms limits scapula movement and as such reduces range of motion making it harder to contract the lats fully.
With the close grip chinup the stretch at the top is different because the scapula is being pulled directly up, it's still strong stretch but it seems to stretch a different portion of the lats. The biggest advantage however with the close grip exercises is the increased range of motion at the bottom. The position of the shoulders and arms allows the scapula to be pulled back and down further which results in a harder contraction and in my experience a greater recruitment of the lower lat musculature.
Close grip is generally considered to work your biceps more, as is underhand (chinup) vs overhand grip (pullup).
Cliffs
-Wide grips stretch to your upper lats and Teres well but sacrifice your range of motion
-Close grips give a still stretches your lats but the biggest benefit is the increased range of motion.


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