Hip Extensions on GHD: Set up so that the pelvis is clear of the pads, and without any movement in the torso, extend and flex at the hip only. Lumbar curve/torso stays rigid. Torso starts perpendicular to the floor. Torso finishes parallel to floor. Keep it a slow, controlled movement.
Back Extensions on GHD: Set up so that the pelvis is trapped on the pads, and without any movement in the hip, extend and flex at the trunk only. Torso finishes parallel to floor.
Hip/Back Extensions on GHD: Set up so that the pelvis is clear of the pads, and in a wave of
contraction starting from the hip and moving up through the back rise to horizontal or “snake up”
one vertebrae at a time from low back to neck. Torso finishes parallel to floor. Keep it a slow and
controlled movement.