Final answer:
The correct guideline for a 6'9, 230 lb. male client who has been performing traditional resistance training for the past six months is B. When determining the correct ball size, the client's thighs should be parallel to the ground when sitting on the ball with the feet flat on the floor.
Step-by-step explanation:
The correct guideline for a 6'9, 230 lb. male client who has been performing traditional resistance training for the past six months is B. When determining the correct ball size, the client's thighs should be parallel to the ground when sitting on the ball with the feet flat on the floor.