because people actually do them and stick to them The same can be said of any beneficial practice while it's trendy. HIIT and intermittent fasting are trendy

because people actually do them and stick to them The same can be said of any beneficial practice while it's trendy. HIIT and intermittent fasting are trendy right now. Nothing can stop the wheel of fashion from turning, so let's wait and see if they still stand out as "something people actually do" when they're passé.