The Goblet Squat is a fantastic exercise for building lower-body strength and teaching perfect Squat form. But unlike the Back Squat and Front Squat, you can perform variations of the Goblet Squat that target your core.
This is only possible because you hold the kettlebell or dumbbell in front of your chest in the goblet position. You have freedom to move the weight with your arms, which is not feasible when you have a heavy bar across your back or shoulders.
Something as simple as performing a Curl in the squat position completely changes how the weight affects your body. As you lower the weight, it travels further from your center of mass, increasing the amount of torque you have to to resist. Your core works hard to stabilize and prevent your torso from tilting forward midway through the rep, when the weight is furthest from your body.