Listen up: Reese Witherspoon shares her personal take on what you need to do to achieve the perfect summer body — and we know you can do it!. If you’re looking for a solid and practical workout tip to tryout before booking your summer vacation, then look no further than Reese Witherspoon’s,45, Instagram account. The Academy Award winner shared with her millions of Instagram followers her number one advice for achieving a smokin’ summer body. So, what is it? Well, you simply need to …. have a body That’s all! Look, you just did it! Good for you!