In Pilates the word "core" gets thrown around a thousand different ways. But as humans why is feeling connected, centered and balanced in this part of our body important? When your center is out of whack, weak or disconnected, it's like living in a house with a shaky foundation.
1 the earth's core: CENTER, interior, middle, nucleus; recesses, bowels, depths; informal innards; literary midst.
2 the core of the argument: HEART, heart of the matter, nucleus, nub, kernel, marrow, meant, essence, quintessence, crux, gist, pith, substance, basis, fundamentals; informal nitty-gritty, brass tacks, nuts and bolts.
the core issue: CENTRAL, key, basic, fundamental, principal, primary, main, chief, crucial, vital, essential; informal number-one. ANTONYMS peripheral.