20Rm Back Squat & Tabata Dubs and Pistols Posted on June 9, 2016 by Matt FRIDAY 100616 Back squat 20RM With approx. 60-70% of 1RM, one unbroken set of back squats. Then, Tabata double-unders Tabata pistols Tabata double-unders Score is lowest scoring interval from the 8 intervals for each exercise, i.e 36/9/36. Scale to single-unders and squats.