"Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." Today's ab routines are more versatile than ever. Sure, you can slog through sets of situps and ...

Ready for the first fitness challenge of 2020? We’re going to get acquainted with the infamous ab wheel, better known as “Hey, what’s this? I bet I can—oof.” (And here you fall on your face.) We’ll ...