VEVOR Preacher Curl Machine, 2 in 1 Bicep Curl Machine and Triceps Extension Machine, Seated Arm Isolated Bicep Station, Strength Training Workout Weight Bench, Exercise Equipment for Home Gym

Yes, you absolutely can do one arm at a time with this preacher curl bench. It supports single arm curls perfectly, which helps you better isolate and train your biceps on each side separately.