Add Yahoo as a preferred source to see more of our stories on Google. While classic core exercises like sit-ups and crunches are certainly an effective way to train your abs, they are not the only way ...

Also, not going to lie, I was surprised by how difficult this workout was. I went in thinking, "How hard can it be?" The song is less than four minutes long, and the tempo isn't that fast. But ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Shutterstock/ Light ...

While classic core exercises like sit-ups and crunches are certainly an effective way to train your abs, they are not the only way. If you prefer to stay standing for your workouts, then this ...