[ Ссылка ] This is a great progression from the traditional plank. By adding an unstable tool, such as the stability ball, we easily increase the intensity. Also, by elevating the feet and by incorporating small movements such as circles and spelling the alphabet, we can really challenge the core muscles on both the front-side and back-side of the body. Be sure to watch the lumbar spine on this exercise as our goal is to maintain a neutral spine throughout.
