Smarter Planks for a Stronger Flatter Belly After 50

https://www.flippingfifty.com/any-age Core exercise and "any" random exercise for "everyone" and "all ages" will take you no where. How could it?
Most exercise research is performed on young athletic men. Women in menopause are anything but that them in terms of body composition, metabolism, and muscle mass.
Want more core exercises that are smarter ? Less injury for a stronger core? https://www.flippingfifty.com/core-challenge