Part 2 of 4 columns on Dynamic Systems Theory. Like biological systems, psychological systems also arise from the coupling of many cyclic (oscillating) processes. For instance, over our lifespan, our bodies change and go through several attractor states. Healthy lifestyle is important, but should not only be a revenue model for economic powers (including gyms, healthcare and research groups). Keeping your body in a 21-year-old state for as long as possible is admirable - it takes a lot of discipline, training, etc. - but it produces at least as much frustration, fear and sadness.