Caspar Lee is an ex-YouTuber and entrepreneur who uses AI to help him plan his exercise each week.David Parry for Google PixelCaspar Lee is an ex-YouTuber turned entrepreneur and venture capital fund owner.He shared his tactics for staying fit while running his own businesses and traveling often.These include using AI tools, walking as much as possible, and combining exercise with socializing.Caspar Lee may no longer be a YouTuber, but he's still involved in the influencer world behind the scenes.Lee, 30, is based in London and co-founded three companies: the marketing agency Influencer, the talent management company MVE, and the venture capital fund Creator Ventures.With so many projects on the go, his schedule looks very different from week to week, and it can be hard to maintain a consistent fitness routine."I don't need to be able to run for over two hours, but I don't want to struggle if I go for a run," he told Business Insider as part of his campaign to promote Google's AI, Gemini Live.