I definitely feel my abs working during chin ups, I assumed everyone did. It came as no surprise to me that there was so much activation reported when Contreras tested that.
It didn't come as a surprise to me, either. I don't question you feel your abs to at least some extent on chin ups, it's not unheard of. However i'm questioning the relevance of what you feel vs what is going on and to what effect. Going by your indicators of effectiveness (DOMS, "feeling the burn" , etc), and throwing in Brets EMG data, you should "feel" your abs in chin ups more than you feel them in sit ups, crunches, leg raises, etc.
Then again, my abs are quite weak in comparison to the rest of me so that could be a factor.
Could be. I must admit I don't think i've ever had DOMS in my abs from chin ups, and rarely feel them to any noticeable effect. However, I have had 1 or clients tell me they could "feel" them working.
Likewise, the first few times people do stir the pot or pallof press, most of the time they DON'T "feel" their abs doing much of anything, but are rewarded with some really nice DOMS over the next few days. Interestingly i've noticed as they get better and can "feel" the abs doing what they're supposed to do, they tend to not get any DOMS. Not really a surprise, as one of the things we do know about DOMS is that "new stuff" seems to cause it. One of the things we don't know is whether it has any relevance whatsoever on how the exercise or workout went.
As an aside, the worse "midsection" (abs and obliques) DOMS i've ever had was from learning how to do leg kicks.
Don't Turkish get ups start with a loaded sit up?
In short, yes. But not really <----- temped to leave it at this just for the wording
First thought is I wonder the relevance? It's a very small part of a large sequence of movements. However, no it's not a sit up. It's really the second step, well actually the third step if you include rolling over from the fetal position. You press a weight out, lock the arm, pack your shoulder (this is key), your knee on the same side is bent, your opposite hand is on the floor. You dig the heel of the bent leg in (kinda like squatting),whist driving your chest up, leading with the sternum, rolling on to the elbow of the other hand. The chest shouldn't cave in, this is actually what i'd consider technique break down. It indicates a loss of core control and normally you'll see the bent leg lift off the ground when this happens, too. If this does occur then you have something that looks a lot more like a traditional situp. This step gets referred to as "punch and crunch" but, there should be minimal flexion if any, though. In truth a decent weight WILL cause minimal flexion, but the chest shouldn't cave in and if it does, you've just compromised movement/joint integrity which defies the point in the exercise in my book (unless you're going for a PB, in which case, it's game time and sometimes sh*t goes bad).
So, yes, it could be said the first part is a loaded sit up. The similarity is like comparing, say, a Box Squat to those ankle quarter squats that most people in most gyms do. You could say they're the same because they're both squats but when you really look at them they're drastically different.
Can you tell i've fell in love with Turkish Get ups recently?
Also, if I want to stop my back arching during OH press, I have to squeeze my abs like crazy.
During front squats, if I'm going to stop them hurting my back I have to brace my abs so hard that they sometimes fatigue before my legs do! Although again my specific weaknesses make me not such a great example.
Agree on OH press but we're going by feel in these movement vs feel on more traditional forms of "ab work".
On front squats - we need to book this other session - i'd actually argue your abs are strong, bob, and it's your hips you need to engage more. However, you are still correct and front squats are a great exercise to "feel" your abs - actually the "plate loaded" front squat, you will feel it even more (holding a plate in the front raise position).
It's just how much weight (pun intended) you put on feel/doms/lactic acid, etc, i'm questioning.