Why Your Back Pain Probably Isn't Your "Weak Core" https://www.activebalancephysio.com.au/why-your-back-pain-probably-isn-t-just-a-weak-core The trouble with the "weak core" story is that it tends to send people down a narrow path: endless crunches, planks, and bird-dogs, done in isolation, while the actual contributing factors go unaddressed.