There are many sit-up variations that can help you achieve your weight loss goals, as well as keep your fitness regime interesting. They engage multiple muscle groups, including the core ...

The fitness world has embraced a new champion in core training, and traditional sit-ups have taken a backseat. The plank, ...

Place your hands by your temples, with your elbows pointing out to the side. Lift your left knee, and at the same time, bend ...