Certified Nutritionist and Fitness Coach on Instagram: "(Save this workout) Do this in the morning on an empty stomach. This will fire up your core and boost fat burn: 👊 Stand tall. 👊 Lift one arm overhead and bring the opposite elbow to your lifted knee. 👊 Alternate sides for 8 reps each. 👊 Then march in place for 15 strong steps—knees high, arms pumping. 👊 Repeat the sequence, dropping down to 7 reps, then 6, then 5… all the way to 1. This not only strengthens your deep core but also revs