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@jamesm1978 I edited one in. Sorry for not doing in the first place.

@dreamshippieslove We're probably related!

@patrick8 Yes, you are right. No forearm muscle activity was measured.

@dreamshippieslove Small nose?

@missymckibben It was quite an interesting conclusion. It makes sense that core activation is higher with scapulas adducted, but I always did them in protraction as you're saying. Honestly, I don't know in what is this advice based on.

@halleluyah Thanks, I'll change the link in my reply!

@godspell Push-ups I can't say, but nose size is correlated with height, so pull-ups should be harder for people with large noses!

@dawn16 Yes! Other article: Electromyographic analysis of muscle activation during pull-up variations. They compared pull-up, chin-up, rope pull-up and neutral grip. Mostly similar, however more activation of mid trapezius during eccentric phase on pull-up. The conclusion: EDIT: changed link...

@erinandrew That's correct. 50% half of shoulder width and 150% one and a half.

@mph Exactly right! Thanks

@coconut23 Fair point. My goal was not to provide a complete guide to core training, although I see how it would be useful. I searched pubmed and tried to summarized the papers I found more interesting or with information I never found before.

What’s the “core”? Huxel Bliven et al The “core,” also referred to as the lumbopelvic-hip complex, is a 3-dimensional space with muscular boundaries: diaphragm (superior), abdominal and oblique muscles (anterior-lateral), paraspinal and gluteal muscles (posterior), and pelvic floor and hip...

@lambo53 Thank you! I'll try to write about push-ups next time, but there's a lot published!

@quake It's possible... This is a single study, and it's not showing a higher number of lesions comparing a group that does chin-ups and a group that does pull-ups. It's just a theoretical hypothesis. Personally, if I was doing a lot of volume, I would avoid chin-ups. But I don't think the...

@dawn16 You're welcome! It's the kind of thing I can't just go with someone's feel or opinion... As I was doing the research anyways, it's not hard to compile for you guys.

@ellie21 Regarding chin-ups, it appears the problem is the external rotation, and it's more noticeable in the hanging and starting phases. For wide pull-ups, there's an interesting concern:

@onthepathtogod Here you go

@lunanica It is too much... And he continued:

@fromgenesistorevelation These are good points, and I don't know if they could be corrected or diminished with proper coaching. Unfortunately, there's no research on form... I hope there will be more in the future with all the tracking software out there. I found one article that compares...

@7messrobhackopen These are the numbers: These are significant, but I don't know if in practice it makes that big of a difference, meaning: will your biceps develop significantly more if you do chin-ups instead of pull-ups? Probably not...