The hollow rock is an exercise that teaches you how to engage your core!
Start laying down on the ground flat on your back
Start with your knees bent
Raise your arms above your head
Hold one leg upward and then bring the other leg up parallel with it
Keep your core tight and rock back and forth
EXPLAINED BY:
Coach Bronson Dant
You can find Bronson on Instagram at @bronsondant72 his website is https://apxts.com