The Twin Suns was an ancient lightsaber sparring technique, used by the Jedi during the days of the Great Sith War and the Jedi Civil War. In this form of practice, two Jedi would use the Force to rise and land like two suns crossing the sky. It required a great mastery in lightsaber combat, high attunement with the Force and precise timing.
This technique required two Jedi to stand at the opposite ends of an open area. Then the combatants would start running at each other and make a Force Jump toward the opponent. While in the air the Jedi would activate their lightsabers and when crossed beside in mid-air, they would strike at one another, trying to harmlessly cut a piece of opponent's clothing and then deactivate the lightsaber before landing on the ground.