There are several types of Lock Step in International Standard Waltz. A "lock step" is when the moving foot approaches to the standing foot and crosses in front of or behind it, creating a "check" position.
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There are several locking steps in Waltz, including the Back Lock, which is a Bronze syllabus figure, the Turning Lock, which is a Silver syllabus figure, or the Turning Lock to Right, which is a Gold syllabus figure.
Back Lock
The Back Lock is a Bronze syllabus step. It is a progressive figure borrowed from Quickstep. It is commonly used as the ending to a Progressive Chasse to Right.
Turning Lock
The Turning Lock is a Silver syllabus step. It transitions from a right turning figure into a left-turning one.
Turning Lock to Right
The Turning Lock to Right is a Gold syllabus step. It was only added to the ISTD Syllabus after 1966, due to its increasing popularity.