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Alejandra Ruff | LONGEVITY HEALTH COACH on Instagram: "This brain-body coordination move looks silly… but it’s actually stimulating your prefrontal cortex — the area responsible for decision-making, focus, and memory. 🧠 Studies show that doing cross-body exercises like this daily can support brain health and lower dementia risk over time. Here’s how to do it: 👉 make a fist (thumb free) with one hand 👉 with the other hand point 4 fingers at the fist 👉 then start to alternate back and forth 👉