Mike Goddard was sitting on a top-of-the-line, mid-level Matrix abdominal crunch machine at the new Prisco Community Center fitness area, looking wistfully around at a room with almost no other people ...

Our core is made up of four muscle groups that are essential to everyday movements, like walking and lifting. And when people think about core strengthening, crunches are often the first thing that ...

Sit-ups target your abdominal muscles, back muscles, and hip flexors, while crunches only target your abdominal muscles. • ...