Chest day may get a lot of hype, but the data says otherwise. 📈 Back was the #1 muscle group for strength gains in 2025, a year dominated by upper-body lifts. 💪 🏋️‍♂️ #fitbod #fitbodapp #bestaitfitnessapp #bestaifitness #strengthtraining #machinelearningfitness #fitbodstateofstrength