Anxieties around a possible bubble forming in AI have risen steadily all year. There's a strategy market pros are recommending for investors worried about the AI party suddenly stopping. A barbell portfolio balances high- and low-risk assets to offer investors downside protection. The barbell strategy. It's not a gym bro thing, but rather, it's an increasingly common bit of investing advice from some of the market's top strategists amid fears of an AI bubble. It refers to an investing approach tha ...