Driver bump and shift: belt buckle left, sternum right
For the driver, the speaker feels his belt buckle move about one inch left of his body's midpoint while his sternum shifts slightly to the right. He describes this as a 'bump and shift' where he bumps and slightly drops the spine angle back. He says this helps him load over the inside of his back foot and, staying centered, hit more up through the ball.
Channel: PorzakGolf
Watch official source at 5:27Why this context matters
Described as a feel for the driver, contrasted with keeping the sternum still for irons.