A Princess of Mars by Edgar Rice Burroughs 1917

Imagine being transported to a distant planet that is far more advanced than your own. Because of his different bone density and the planet's low gravity, Carter is able to jump high and perform feats of incredible strength. You have strength and power beyond your dreams. Then you meet a fierce alien race and are taken prisoner alongside another human, only to find out that there are many people on this strange planet and they are at war with one another. Welcome to John Carter, A Princess of Mars. The book follows Confederate veteran John Carter after he is suddenly transported from a cave in Arizona to the planet Mars. Carter falls in with a gang of Martians called Tharks, and eventually wins the heart of Heliumite princess Dejah Thoris.