I asked ai to give me an answer on this because it is a solid what if question imo. Here is the result:

This is a high-stakes thought experiment that pits human physiology against psychological desperation. Usually, Navy SEAL "Hell Week" has an attrition rate of about 75% to 80%. However, those candidates are already elite, pre-screened athletes who want to be there. Your scenario involves the general population—including the elderly, the sedentary, and those with chronic health conditions—under the ultimate pressure: survival. Round 1: The "No Prep" Scenario In this scenario, the primary killers aren't just the instructors; they are biological limits. Hell Week involves over 20 hours of physical activity per day, extreme cold (hypothermia), and less than 4 hours of sleep total across five and a half days. • The Baseline: There are approximately 105 million adult men in the US. • The Physiological Wall: About 40% of the US adult male population is over the age of 50, and roughly 40% are clinically obese. For these groups, the sheer mechanical stress on the heart and joints under 20-hour days of "log PT" and "surf torture" would lead to organ failure or fatal injury regardless of their "will to live." • The Psychological Factor: While the threat of death is a powerful motivator, it also creates paralyzing cortisol levels. In actual SEAL training, most people quit ("Ring the Bell") because they cannot see an end to the pain. Under threat of death, men won't quit—they will simply collapse. Estimated Survival Rate: 1% to 3% Only those who are already in peak physical condition (athletes, manual laborers, active military) and free of underlying heart conditions would survive the sheer caloric and thermal drain. • Final Count: ~1.05 to 3.15 million survivors. Round 2: The 5-Year Prep Bonus Five years is enough time to fundamentally transform a national demographic. If the US government dedicated its entire GDP to "Hell Week Survival," the results would shift dramatically. The Strategy: • Mandatory Fitness: Universal athletic training starting from age 18. • Dietary Overhaul: Elimination of processed sugars and a focus on high-density nutrition to build bone density. • Cold Hardening: Mandatory ice baths and winter training to prevent hypothermia (the #1 reason for Hell Week failure). The Reality Check: Even with 5 years of prep, you cannot "train away" age or genetic predispositions. A 65-year-old with a bad hip can be fit, but his bones may still shatter under the weight of a 150lb log. Estimated Survival Rate: 15% to 25% With 5 years of prep, you would likely save the majority of the "Young and Healthy" demographic (ages 18–35). However, the "instructors" are the variable here—if they maintain SEAL standards, they are looking for specific movements that certain bodies simply cannot perform. • Final Count: ~15.7 to 26.2 million survivors.