A Goblet Squat with DB is the most simple exercise in the Squat category. It’s understandable to think that a body weight squat is more simple but that isn’t the case. The addition of a moderately heavy dumbbell creates a constraint on a squat pattern which strongly encourages the athlete to maintain a static and braced neutral spine throughout. This is true of other Front Squat derivatives (Goblet Squat with Barbell, Front Squat with KB’s and Front Squats) but not Back Squat derivatives… or body weight squats.
What makes Goblet Squats with DB the most simple of the Front Squat derivatives is that they require the least thoracic spine extension, shoulder and hip range of motion.
The combination of these 2 factors (provision of strong positive constraint on lumbar spine posture + low shoulder range of motion demands) makes Goblet Squat with DB the easiest way to coach a beginner to squat.