I did 50 plank reaches every day for a week — here’s what happened

Here on the Tom’s Guide fitness desk, there’s nothing we love more than a plank variation. Next up on my list of activities to add to my routine for a week was the plank reach, an exercise that works the six-pack muscles (the rectus abdominis), the deepest abdominal muscles (the transverse abdominis), and the internal and external oblique muscles, as well as the shoulders and the lower back. 

But how do you do it, and what would doing 50 reps a day do my core? Read on to find out.