Tip: The Single-Arm Plank

If you could only choose one exercise to train your core, it should be the single-arm plank.

Maintain solid spinal alignment. Most people who are new to this will want to cheat the single-arm plank by creating cervical hyper-extension and tilting their heads up. This strains the neck and places excessive tension on the lumbar spine by causing the hips to sag.

Focus on keeping a tall and elongated neck throughout rather than tilting the head up or down.