The very beginning; the GIT-GO, square one: One usually starts at the beginning of the endeavor, or from Jump Street
[1980s+; at the first jump in the same sense is found by 1577]
Tatum and Hill reunite in 22 jump street as Jenko and Schmidt, hapless cops who go undercover as students to bungle a drug ring.
He starred in two of the most entertaining movies of last year, Magic Mike and 21 jump street.
In 21 jump street his high-school villain nearly steals the film.