NASM-certified personal trainer and registered dietitian Leah Barron told POPSUGAR that she likes side planks because they build core stability, which in turn helps us keep proper form during weightlifting and maintain proper posture in our daily lives.
Begin by lying on your left side. Bring your left elbow directly under your left shoulder. Stack your feet on top of each other, or stagger your feet in front of each other.
Press your left elbow into the floor, and rise into side elbow plank with your abs pulled into your spine.
Barron suggests holding your side plank for 30 seconds and increasing your time by five to 10 seconds each time you work out if you feel comfortable.