The Copenhagen Plank is the Regina George of core stability exercises. Beautiful and evil. This plank variation is great for runners or anyone who wants to improve frontal plane stability and adductor strength. Which is like, almost everyone! Hat tip to @dr.markpt and @pt.renew.
Read MoreNot all ab exercises are created equal. Three, called the McGill Big 3, set the foundation for not only a toned midsection but also a strong core that protects and prevents your back from injury. Spoiler alert: No traditional crunches in this program! Become a pro at these powerhouse core moves by watching my video series for LiveStrong.com.
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