Most Progress Photos Lie
Most progress photos lie. The body didn't change that much — the camera moved.
Phone on a tripod facing you, and mark where your feet go. Your last photo sits faded on the screen, so you move until you line up. Hit the timer, walk back, and you get the pair right away — keep it, or shoot it again.
Two shots a week: front relaxed, then side with your arms forward and palms down.