This document discusses how using an average expected rate of return to plan for retirement can underestimate the risks posed by market volatility and downturns. It shows through examples how negative returns early in retirement can deplete savings to the point where recovery is impossible, even if markets later rebound. It advocates using strategies to transfer investment and longevity risks to a third party in order to "disaster proof" retirement and ensure income lasts for life regardless of market conditions. The document suggests getting a free retirement stress test to assess risks and determine if current plans are resilient enough to protect against financial disaster in retirement.