Founders still build first and validate later—wasting years and capital. The real bottleneck isn’t knowledge; it’s disciplined execution. Treat validation like fitness: consistency beats spurts. Run strict gates before you write code: deep customer interviews, design mockups, then the 50% Rule—if half of interviewees won’t commit to a free beta, stop. Run the beta, then convert over 50% to paid. Track hidden behaviors that predict success: weekly customer conversations, a 48-hour pause before building, and celebrate learning (even rejections). AI makes prototyping cheap and fast—so misbuilding is now easier than ever. Use speed to learn, not to ship slop. Support founders across multiple attempts, not zombie startups. Measure what matters: customer insights and behavior change, not GitHub commits. Subscribe and share this episode with a founder who’s itching to code. Then set a 7‑day challenge: 25 customer conversations, one mockup sprint, and a go/no-go decision using the 50% Rule.