Warm up before a run

This crossword clue is for the definition: Warm up before a run.
it’s A 20 letters crossword puzzle definition.
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Possible Answers: STRETCH.

Last seen on: LA Times Crossword 19 Jun 19, Wednesday

Random information on the term “STRETCH”:

Los Alamos National Laboratory (Los Alamos or LANL for short) is a United States Department of Energy national laboratory initially organized during World War II for the design of nuclear weapons as part of the Manhattan Project. It is located a short distance northwest of Santa Fe, New Mexico in the southwestern United States.

Los Alamos was selected as the top secret location for bomb design in late 1942, and officially commissioned the next year. At the time it was known as Project Y, one of a series of laboratories located across the United States given letter names to maintain their secrecy. Los Alamos was the center for design and overall coordination, while the other labs, today known as Oak Ridge and Hanford, concentrated on the production of uranium and plutonium bomb fuels. Los Alamos was the heart of the project, collecting together some of the world’s most famous scientists, among them numerous Nobel Prize winners. The site was known variously as Project Y, Los Alamos Laboratory, and Los Alamos Scientific Laboratory through this period.

STRETCH on Wikipedia