The best part of many epic action sagas is the training montage. My favorite ones are in Rocky and The Karate Kid. The team over at SlackStory put together this epic montage of montages.
Here are the movies they used for the video:
Rocky I, II, III, IV, Bloodsport, Bring It On, Chariots of Fire, Cool Runnings, The Cutting Edge, Footloose, Full Metal Jacket, Highlander, Snake in Eagle's Shadow, Kill Bill (vol. 2), Mulan, No Retreat No Surrender, Ratatouille, Regular Show (Ep. 4 "Death Punchies"), Run Fatboy Run, Step Up Revolution, Team America: World Police, The 36th Chamber of Shaolin, The Incredibles, and X-Men: First Class.
Watch the video and see the awesomeness for yourself: