We combed our video library to bring you another STACK Top Five video compilation. This time, we looked for the most difficult "core" exercises, as performed by the elite athletes we feature on STACK.com, including NFL stars Drew Brees and Dwight Freeney and NBA All-Star Dwight Howard. Find out which pro athletes pack the most heat when it comes to their training their core.
Want a diversion? Watch The STACK Top 5 Most Bizarre Exercises.
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