This is one of the last training sequences Ben Bruce goes through during his post-run workout progression. He begins by doing a series of forward lunges, then later backwards lunges and finally side lunges. He emphasizes remaining upright at all times. This workout is huge for runners because it works both forward movement and lateral movement in the runner -where as, oftentimes, runners get caught in repetition mode by only running forward. Bruce says you, “gotta work at everything” (meaning with both forward and lateral movement) to fully develop the body.