I love to hear you talking about the problem of optimizing longevity using a linear programming framework. What would a sensitivity analysis of that model look like - especially concerning the constraints on which many people don't want to budge (e.g., "I have to have a big dietary cheat day every week", "I just can't get 8 hours of sleep a night", "I refuse to train in zone 2", etc.)? In essence, which common points of friction are most critical to overcome and which ones can people tend to 'get away with'?