@popsugar.official: The pop divas are hitting the squat racks — just ask Hilary Duff. In partnership with Ladder, the Y2K icon revealed her go-to workout routine consists of some serious strength training, including weighted split squats, medicine ball slams, dumbbell rows, and barbell back squats. We decided to give her regimen a try, with guidance from Duff's actual trainer, Kelly Matthews. And spoiler: our muscles are still recovering.