Squat lower back rounding

[danz]

Uploading for a friend.

Things I have noticed:
- His lower back arches a bit at the lower half of the movement.
- His back angle is probably too vertical, maybe from the habit of High Bar Squat.

Some points to take into account:
- He has been doing high bar squats for a long time. He did 117.5kg 2 weeks ago, and decided to switch to LB (as is intended as part of the program).
- He is experiencing groin (adductor and inside towards the knee) strain/pain when going down below parallel and being horizontal. He does a long warm up and stretches to be able to go deep at all. He has also felt this in HB but it aggravated in LB.
- He claims to be bracing his lower back and abs real tight.

Is it possible the adductor strain is related to the rounding of the back?

In the book there is a section that addresses this and gives an exercise to control the lower back, where you lay down on the floor on your belly. He claims this doesn't help him much and he knows how to extend the lower back generally (i.e. in the Deadlift he doesn't have this issue).

Any idea what the issue may be? Thanks!

Two different angles:
Squat form check LB 105kg - YouTube

Squat form check 100kg (3rd) - YouTube

[Satch12879]

There’s lots to fix here. Upper back is flexed. You can tell he was high bar squatting. He’s not leaning over at all. Low back is not even an issue.

[danz]

There’s lots to fix here. Upper back is flexed. You can tell he was high bar squatting. He’s not leaning over at all. Low back is not even an issue.

Thanks for the comment. I tried to cue him to point the chest at the floor, and chest out. Doesn't seem to help. It seems like when he comes to around parallel (even with no bar), he begins to round the lower back to hit depth, even though his knees are out. Not sure exactly what other cues may help. He seems convinced it is a flexibility issue.

[Maybach]

The bar may not be in the correct position at the top: his grip is loose. His elbows and arms should have the relationship to his torso that they assume right when he "tightens up" to begin the descent. Have him move the bar down is back a shade and pull his elbows in more. This may fix the high-barring.