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After Sheldon scientifically calculates his life expectancy, he is dismayed to learn that he will be a few years short of the time when he will be able to transfer his conscious self into a robotic format. So he decides to live a healthier lifestyle to eke out those few extra years. Those changes include eating healthier and exercising. When both those avenues have negative consequences unexpected to him, Sheldon thinks he's figured out a way to exist in his current life without taking the risks associated with everyday tasks. As an incredulous Leonard, Penny, Howard and Raj look on to what Sheldon is doing, only a celebrity sighting may be able to bring Sheldon back to real life.