Back Squat 3×4 / Tabata Pull-Up, Sit-Up, Box Jump Posted on December 22, 2014 by Matt TUESDAY 231214 Back squat 3×4 Then, 8 rounds for reps of: Tabata pull-ups Tabata box jumps, 24/20″ Tabata sit-ups 24 intervals of 20 seconds work and 10 seconds rest. Move to the next exercise each interval. Score is total reps.