When moving up or down the ladder, each word will have one (and only one) letter replaced at a time. Start at the top or bottom.
Example: HIKE → BIKE → BAKE…
One: Convinced
Two: One and only
Three: In need of an ice bath, say
Four: Word that becomes its own synonym when the letters “AS” are added to the front
Five: Bunker
Six: Shape
Seven: Dance move involving wriggling