I’ve got magnificent mobility. I do the basic routine before lifting, but I’ll start doing a more extensive routine everyday now.
looks more like you’re lacking torso strength/stability than mobility, your starting position isn’t bad then you lose it.
i agree with some others that say drop the weight down a bit and see if you can do perfect form there. increase weight week to week (don’t get greedy).
disclaimer: the following is not on topic.
also, a 410 deadstop squat is huge compared to a 405 sumo DL.
mine was 275 for the deadstop backsquat when my sumo DL was 430…depth?
My current strength on deadstop squats is 365x4, but that was after a late night out at a party - should have hit 365x5/6 really. 1RM is approx. 400 - haven’t tested true limit because I haven’t been training singles and don’t want to jump straight in.
Depth is parallel. The reason my deadstop squat is so much higher is because I’ve been doing them for the last 6 months. I’ve only ever done sumo deadlifts once or twice before when I first started lifting about 3 years ago - so the video I posted is effectively my first attempt at them after switching from rack pulls when I got to 528lbx13.
I’m hoping my sumo deadlift will be higher than 400lbx5 when my deadstop squat is 410x5. Perhaps I’m being stupid but it doesn’t feel like torso strength is the issue - when I’m actually doing the sumo deadlift it feels like my glutes/hips aren’t really turning on/working with my thighs/back.
I feel like I’m not actually making use of the strength I’ve got due to poor technique so my lower back is trying to compensate for something not working. This bit in the Robertson article describes it pretty well:
'You are a lot stronger doing a ½ squat than a full squat, mostly because your hips are higher, putting the posterior chain in a more advantageous position biomechanically. However, as soon as your head and chest start to bend over you take away that biomechanical advantage; your hips are now too high and your chest is bent over.
You might smoke the weight off the floor, but the weight tends to get out in front of you, your legs lock out too soon, and the low back has to work overtime to correct the line of pull.’
Slow motion video of practice reps with 140kg from earlier tonight - hopefully it will load… Very obvious that the problem is leading with the hips (and also not keeping shoulder blades retracted) in the first few inches of the ascent. This shouldn’t be too difficult to fix.