Planks vs. crunches – which one should you do? If you consult any fitness magazine or just look into what fitness-oriented people are raving about on social media, you’ll notice that planks have become sort of a cure-all exercise. They have become the most popular choice for sculpting firm and powerful abdominal muscles, and fitness experts seem to becoming disillusioned with the effects of the traditional crunch, once a mainstay ab-toning move. But, like in any other industry, fitness trends are meant to come and go – remember when sit-ups were the flavor of the month? The problem with these