In Pilates we talk about the core all the time, “use your core.” This does not mean tucking to get use of the core. It actually means letting the spine enjoy the last curve, the lumbar lower curve and not tucking. So often I see & hear students say “oh that’s what I was taught. Bruce King (One of Joseph disciples, there were 6 he was 1) talked about leaving the spine as it is which is not talking the curve out of it. He was my teacher.
More to come about the core.