Making butter while running? Who first came up with such an inventive idea? The so-called "Butter Run" — running while holding heavy cream in a ziplock bag to churn it into butter — has emerged as a new trend in running culture. Heavy cream is an emulsion in which fat is mixed with water. Shaking it vigorously breaks the protective membrane surrounding the fat globules, causing them to clump together. Drawing on this principle, runners use the shaking motion of running to make butter. The appeal of combining the health benefits of running with the fun of cooking has gone viral on social media, generating buzz among younger generations.
