These six bodyweight moves activate your entire core without a single crunch. They build strength, coordination, and endurance, and they'll leave your abs burning in the best way. No equipment. No ...

Join Runner's World+ for unlimited access to the best training tips for runners Why it works: The cross-body crunch hits your entire core—the upper, lower, and oblique muscles. The move also ...

Russian Twists engage the obliques and rotational core muscles, vital for spine health and athletic movement. Crunches train ...

No matter which variations you follow, crunches have the advantage over sit-ups of being able to better target abdominal muscles. "Because the movement is smaller, you can control momentum more," ...

Movements like standing bicycle crunches, cross-body knee raises, and oblique side crunches engage the stabilising muscles, improving coordination and reinforcing a balanced physique. Over time, this ...