Plank Jacks - World Wide Lifestyles

Website:http://www.worldwidelifestyles.com/plank-jacks/

Plank jacks exercise primarily focus on core muscles especially the adductor muscles of the hip, and the external and internal oblique. Apart from it, plank jacks are also effective for lower body muscles including glutes, quads, hamstrings and upper body muscles mainly shoulders as well. There are several types of planks for different sets