On max effort days when I lift weights at ~95% or more of whatever I'll achieve on that day, I am unable to keep my breath in the middle of the concentric part.
A recent attempt at 130 kg @ 87 kg, where I am happy about my form, yet you can hear a lip fart, barely at my limit of holding the air in.
Considering the difference in effort between 120 kg and 130 kg, I expected to have a relatively easy 140 kg and most likely grind a 145 kg lift. Yet, my 140 kg attempt came to a complete stop. After exhaling, if it wasn't for the belt pushing against my ribs, I know I would have folded in half. Admittedly, my knees shifted back and my hips went up, so I can appreciate how a good morning position would put extreme pressure on my core.
Here is an older attempt at 125 kg @ 82 kg. I don't believe I get in a good morning position there, yet it still happens. I have relatively long legs for my height, so I except to get quite a bit of a torso lean.
My DL is at a ridiculous 190 kg with great form, yet no sign of even being close to my limit of losing bracing.
I know I brace slightly differently between the two lifts. For the squat, I try to take in as much air as possible and keep everything tight, while for the DL I take a smaller breath or the pressure and general feeling of about to explode makes me sick.
So, what gives? Am I just generally weak in the squat and my sticking point breaks my form down? Is my core weak? If there could be various reasons, how do I go about figuring out which one it is?
I don't know if it matters, but when my low bar was at 120 kg, I had to grind 3x5 @ 80 kg front squats and I'm almost certain I wouldn't have had a single at 90 kg. I don't do front squats frequently, but still, the effort exerted was on a completely different level.
I haven't done direct ab work in forever, because I noticed my core strength improved so much more with just squats.