While I've long forgone working out my abs for aesthetic gains - trust me, it's impossible to spot train body parts and, contrary to what the internet would like you to believe, visible abs are down to a complicated mix of genetics and lifestyle factors that it's really not worth fighting - I still love a core strength challenge.
Working out my midsection makes me feel empowered, and I love the fact that you can do a plank any time, any place, and no matter your fitness level, you'll feel the burn in 2 minutes or less.
