Could anyone advise on the benefits and the reasons for using different grips - underhand/overhand, thumbs over/thumbs under when doing pull-ups/chin-ups and things like bent over row.
They all activate different muscle groups, there was a good vid on the Barstarz youtube chanel about grips in pull-ups and Scott discusses it excellently on and off but I want to know more. It strikes me that grips are one of those things which could produce those little percentage gains that all add up and really help target muscles.