I did 100 plank jacks every day for a week — here’s what happened to my body


What do you get if you cross a jumping jack with a plank? A plank jack. This killer dynamic core move is as intense as it sounds, as you engage your stabilizer muscles to secure your body as you jump your legs in and out. But what are the benefits of a plank jack, and what would happen if I added 100 plank jacks to my exercise routine for a week? 

If you’re looking to get more bang for your buck during your ab workout, the plank jack is a great move to try, as it works your abs and shoulders at the same time. As you jump your legs in and out, your shoulders will be holding your body in a plank, meaning you’ll be working on your shoulder strength, as well as challenging your abdominal muscles in this move. 


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