Primary Muscles: Abdominals, Transversus Abdominis, Multifidus
Secondary Muscles: Internal Obliques, Transversospinalis
Planks are underrated but most important for a slim, tight looking midsection. They also help prevent or treat lower back pain.
Make it fun! Grab a friend and see who can hold the longest plank – or, better yet, start a 30 day plank challenge!