"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." No offense to sit-ups, planks, and hollow holds, but basic core exercises can feel drab day after day.

This one’s an abs-olute winner. A classic, fit-for-all workout is back in the spotlight after a popular workout video resurfaced, showing a fitness influencer’s surefire way to a rock-hard core using ...

Add Yahoo as a preferred source to see more of our stories on Google. Man against grey backdrop performing a single arm overhead kettlebell squat with right arm raised. Build core muscle and ...