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for people beginning pull ups.. i would strongly recommend only going with chin-ups until you can do a few sets of them. obviously doing a good amount of both is optimal, but chin ups (although they are easier) activate all the same muscles as the pull-up plus many more - not just your biceps, even more parts of your back too... it's just a more natural angle of pull overall.
and negatives of both exercises will get you to be able to do a good rep within a few weeks. just jump up and lower yourself down as slowly as you can. i was amazed at how fast i gained strength this way at first... never had to use a chair or resistance bands or anything.
and triceps do play much more of a role than i thought at first.. especially the very beginning of the rep when you're at a dead hang. i thought triceps were only used when extending your elbow.. but learned otherwise after trying pullovers (lay down on floor, arms straight above your head, lift barbell/db above face without moving elbow at all). they are similar to that starting motion of pull ups, a few heavy sets of those will leave your triceps in shambles the next day.
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