This standing core challenge is a favorite of exercise physiologist Tom Holland, a Wilhelmina fitness model and author of Beat the Gym. "This is an advanced move that really targets the obliques as well as those hard-to-target serratus anterior muscles (the muscle that wraps around your rib cage and attaches to the bottom of your shoulder blades), which truly brings out amazing abdominals," Holland says.
Start holding a weighted body bar to the side on one shoulder. Engage your abdominals and twist just your upper body until the bar is in front of you, focusing on contracting one side of your obliques. Return to start. Do 10-25 repetitions to one side, then place the bar on your other shoulder and do 10-25 repetitions to the other side.
