: Day 13 define:upper body and core Man I forgot how fun double days are! I really enjoyed getting both workouts in, especially since Sophia slept through all of define:upper body and woke up with 5 min left of core! So I was able to give fully on the workout! But I will admit I almost switched out core since you do a lot of core work in define:upper body! Only wore my heart rate monitor for core since you don't get your heart pumping hard in define:upper body! #PiYo #day13 #defineupperbody #core #noexcuses #nobackingdown #nopainnogain #sophiakatherine #fitmom #fitness #restandrecovery #beachbody #coach #fitandfun