TriaTrainer - 3-in-1 Oak Physio Exercise BenchTriaTrainer Oak Contemporary, minimalistic design meets variety! This best describes the unique TriaTrainer. In a closed position the TriaTrainer serves as the perfect abs and core trainer. Unfold one side into first position and convert the chair into a semi bench for working your back muscles and glutes. Opened into full extension the TriaTrainer can be used for all well known bench workouts with or without free weights. The footrest can be adjusted