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Beginning (grandma on the left) – Holding a light dumbbell in front of you or using no weight, stand shoulder width apart. Bend legs into a squat as far as you can then return to standing.
Intermediate (mom in middle) – Holding a medium weight on the back of your neck, squat to 90 degrees.
Advanced (me on the right) – Holding a heavy dumbbell on the back of your neck, squat deep past 90 degrees.