For fitness purposes we can roughly divide the body into three sections: the lower body (legs), the core (abs), and upper ...

Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, fitness, and science here since 2015. Beth was the recipient of the 2017 Carnegie Science Award in science ...

Practically every movement you make involves your back in some way — bending, stretching, walking, sitting. A healthy back is key for maintaining balance and coordination, both during exercise and in ...