Just putting this up primarily for insights, discussion and general info on the maintaining of the lumbar arch during squat and deadlift? Feel free to add.
I placed it here because although it relates to general training as well, it's more relevant to heavier work in a way.
On the bench press, undertandably, this is fine, as long as the spinal column is elongated against the actual bend to maintain good posture.
People with limited flexiblity have issues getting a decent lumbar arch, so it's just a case of dealing with those flexibilty issues with foam rolling and exercises and such. But, what about people that are really flexibile in the lumbar spine...the following is a slighty "overkill" picture to prove the point...
How does a very flexible person determine how little
of their flexibility to use during the squat in order not to have an excessive arch? Is there a way to know when the lumbar arch is compromising safety before getting injured, due to the increased flexibility they have?