Day 57 is the start of Phase 3 in 645, which meant the lower body strength workout. This is really a total body workout as you are doing some arm work (by doing a lot of rows) and a lot of core work. In this workout, we go back to 15 reps and increase the pace. There is less downtime between exercises, so you get a lot more of a cardio effect than in the prior weeks.
For XB I did the lower back routine. My back and hips get so tight overnight that it takes about halfway through the six minutes for things to loosen back up. By the end of it my back always feels much better and a lot looser.
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