Level Up Your Plank Workout: 11 Planks to Build Core Strength

By Jason Fitzgerald

When you were a kid, you probably did sit-ups at school for an ab workout. But is the sit-up the best ab exercise? That’s actually a simple question: No way! There are far better ab exercises than a simple sit-up, which can exacerbate back problems and only focuses on one small area of the abdominals.

Source:: Lifehacker