Instagram | Chris Appleton Jennifer Lopez is continuing to spark implant rumors as fans remark on what they think is her newly enhanced chest. The singer, 57, was spotted heading to a gym ahead of the weekend, where she put on a busty display in a plunging workout set. Showcasing her unbelievably fit body in a tight sports top and leggings, JLo proved she’s still putting in the work as she approaches 60, and her muscles were showing it. Looking …