One thing I noticed for myself is that when I found out about shoulder packing and started doing that I noticed that Pull Ups were alot harder than. It really takes some adjusting to when you have been doing it in the uncorrected way for a couple of years.
This is very true. Took me a little while to adjust, but now I love em. I'm helping a friend with pull-ups, and he is having a hard time doing them with packed shoulders. Says they "feel weird."
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Do completely straighten your elbows or keep them slightly bent?
I have been doing weighted pull-ups and have a bit of irritation where my forearm muscles tie into the elbow. I think that leaving my elbows slightly bent would help, or I could reduce the amount of weight around my waist. Which would be preferable, to keep my elbows slightly bent or to use less weight?