Physically, no one can do much without a strong core. This article describes why you should work on it, and how.

Have you ever tried to throw a ball while treading water in a swimming pool? Water polo players notwithstanding, there is little to push against, so no one can throw far. That’s because of Newton’s third Law of motion – for every action there’s an equal and opposite reaction. If we throw something forward, our body absorbs the same force in a backward motion. If the forward force is greater than our body’s ability to absorb and if we are not braced against something solid, we will move backward. The principle is that we can only generate force in one direction when doing so against solid resistance, either within our body or from some external fixed point, in the opposite direction.

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