Glutes
Abdominals, Hamstrings, Lower Back
Position bench perpendicular under Smith bar.
Sit floor, upper back against bench.
Roll bar over hips (use pad).
Feet flat, shoulder-width.
Unrack bar.
Drive through heels, lift hips until body straight shoulders-knees.
Squeeze glutes hard.
Lower hips slowly.
Repeat. Rack bar safely.