And it turns out the plank isn’t just the go-to core move of your favorite fitness instructor, as we found out when we stumbled across this three-minute plank challenge, set by Monique Eastwood.

Lie on your left side with your feet right foot directly in front of your left and your left elbow under your left shoulder, ...

Callisthenics exercises draw on your natural movement; when children climb on monkey bars and jump between pieces of play equipment, they’re basically doing callisthenics. It all depends on how ...