Planks are a great way to work on the core. Not only does it strengthen the core muscles it also helps with posture, stability, and endurance.
The video features various modifications of the plank like the high plank, low plank, and plank twists. These as well as many of the exercises I feature can be done anywhere like the comfort of your own home, the park, the beach, or a gym. #fitnessiseverywhere