The closer your hands are the more difficult the exercise is, however, depending on the position of the hands some people can experience elbow pain so experiment with
wider hand placements until you find one that suits you.
That being said,
the wider your hand placement on pull - ups, the more you get to engage your back muscles, so opt for the wide - grip variant for some extra back stimulation.
Not exact matches
You can target different muscle groups by adjusting your
hands placement: the
wide grip is great for stressing the pecs, while a narrower grip works the triceps better.
Now, your arms certainly won't explode if you decide to use a
wider or more narrow grip (
hand placement) when doing chin - ups.
For example, a narrow
hand placement will result in significantly greater tricep activation than a
wide base
hand placement.
Besides, larger ereaders make for a
wider range of one and two
handed placement and balancing acts, for which fixed - in - place hardware buttons would be inadequate.