Try this Plank Cocktail for a Strong Core!
Try this Plank Cocktail from Coach Kim!
Set a timer for :40 seconds. You hold a plank for :40, then rest for :40, BUT during your rest period perform 10 x Bicycle Crunches per side. Relax for the remaining time.
Do the following Planks for :40 each:
Immediately do 10 Bicycle Crunches per side after each set of planks! Rest for the remaining time.
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