Ari Meisel, who has Crohn's disease, uses a productivity system called "Less Doing" to help people manage stress and increase efficiency. The system is based on three principles: optimize, automate, and outsource. Meisel shares seven tips for improving productivity, including stopping to assess processes, writing down every step of a process, understanding that changing a process takes time, trying a virtual assistant, getting out of one's own way, running a test, keeping the home screen clean, and focusing on optimizing 95% of daily tasks. By following these principles and tips, individuals can reclaim their time and focus on what they want to do.