Good that you already know that "core" means more than just abs. Yes, it's your entire torso (actually, everything except arms, legs and head, I'd say) - back, front and sides.
Next step: training based on that knowledge. Pick a really solid novice weightlifting routine, and stick with it, adding weight to the bar as directed by the routine, or simply whenever you (safely) can. You won't go far wrong, doing that.
Between the squat, deadlift, overhead press, bench press, chinups/pullups/dips, and probably rows and/or power cleans (etc.), your "core" will be plenty worked out. In fact, it'll be worked so hard, you might be tempted to give up on it. That's your call, naturally.
If you're doing a bunch of compound lifts, and you have the option of choosing a few accessory lifts? Well, you could choose to
slightly emphasise the "core" for the time being. Or hey, for the duration - using the definition I posted above, that is. Nothing more crucial than a strong back, for example.
Check out the stickied "Routines and Advice" thread in this forum. Notably, the first bits of it, including links to some full body routines. Pick one, or another similar from elsewhere if you prefer.
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