Final answer:
The 1 KB goblet squat is a variation of the Goblet Squat to a Parallel Box, where a single kettlebell is held at chest level during the exercise.
Step-by-step explanation:
The exercise that is a variation of the Goblet Squat to a Parallel Box is the 1 KB goblet squat. This variation involves holding a single kettlebell (KB) at chest level as you perform a squat down to a box that is set up at a height where your thighs will be parallel to the ground when seated. It's a great exercise for strength and stability, particularly targeting the quads, hamstrings, glutes, and core.
Other options listed such as the squat correctives may refer to various modifications to improve squat technique, the counterbalance squat typically involves holding a weight in front to help with balance and squat depth, and the 2 KB rack pos goblet squat would involve holding two kettlebells in a racked position rather than the goblet position which targets the upper body differently.