Free Workout for core, upper body, shoulders, legs, arms, and rear deltoids. This one exercise hits all major muscle groups and is quite challenging. I recommend starting out slow and working your way up.

First step is to do a basic plank, holding yourself up on your toes and hands. The next step would be to add small weights in each hand and lift one arm at a time. (watch video for demostration) The next progression would be raising opposite(right) leg as your raise the opposite(left) arm with the weights.

Enjoy the exercise.

ABOUT THE AUTHOR: Kevin Moses, BS, CSCS is a San Diego personal trainer and fitness coach specializing in helping individuals with strength training, sports conditioning and weight loss.