What are the minimum requirements for a successful deadlift?

The minimum requirements for a successful deadlift, as stated in option B, entail that the lifter must bring the barbell to a standing position with their legs straight and shoulders back. This reflects the proper mechanics and control necessary for a valid lift in powerlifting competitions.

For a lift to be considered successful, it is crucial that the lifter completes the movement in an upright position, demonstrating full extension of the knees and hips. The shoulders being back signifies that the lifter is fully standing and not leaning forward, which ensures that the lift is accomplished safely and effectively. This aspect is essential for maintaining good lifting form and preventing injury.

Other options do not align with the established standards for a successful deadlift. For instance, lifting the bar to waist height does not meet the requirement of achieving a standing position. Keeping knees bent during a deadlift does not reflect the completion of the lift as it would indicate that the lifter has not fully extended to a standing position. Finally, while grip choices (overhand, mixed, etc.) are important in deadlifting, there is no rule that mandates the use of an overhand grip exclusively for a successful lift. Thus, option B accurately captures the essential requirements for a valid deadlift in powerlifting.