Adults recovering from surgically managed diaphyseal femur or tibia fractures often experience persistent weakness, pain, and functional limitations despite successful fracture healing. This prospective, non-randomized pilot study evaluates the feasibility and acceptability of a structured, supervised resistance training program initiated approximately 12 weeks after surgery, compared with usual postoperative care alone. The study will assess recruitment, adherence, retention, and protocol fidelity, and will collect exploratory patient-reported and physical function outcomes to inform the design of a future randomized controlled trial.