Watch and learn from our three experts how to do planks in this free health and fitness video on athletic strength training exercises for performance.
Expert: Michael Rosengart
Bio: Michael Rosengart is a professional fitness trainer in Santa Monica, California.
Filmmaker: Nili Nathan
thax man
Diaddy28 2 years ago
Your core muscles, which are the abbs and lower to mid back muscles.
F1REWOLFSA 2 years ago
wat does this help you with?
gj4king 3 years ago