Originally Posted by
Ryan Arnold
Yes what I mean is that instead of holding your breath you are letting it out and groaning once you reach depth, which is going to prevent the valsalva and consequently the stretch reflex. You should not be afraid of the stretch reflex. At the bottom of the squat the hamstring shortens from the attachment at the knee and lengthens from the attachment at the hip, resulting in it being at resting length at the bottom. This is enough to create tension to "bounce" off of, but not as much as say something like an RDL or deficit deadlift which will overstretch the hamstring. Additionally, the low bar squat puts zero stress on the ligaments of the knee, which is why people who have had their ACL's removed have been able to perform the low bar squat without issue. All the work is done by the surrounding musculature.