TranSitions in the tunnel can be defined as movements that begin and end in stable, neutral flight and either change or pass through different body attitudes or orientations.

TranSitions can be categorized in two ways: by discipline or difficulty. The disciplines are Belly, Back Fly, Sit Fly and Head Down. The difficulty of the tranSitions can be categorized as Basic, Intermediate, Advanced and Expert. For example, as part of earning an "Advanced Belly Fly" checkbox, a flyer would have to learn the advanced, Belly fly tranSition shown in the chart below.

Each tranSition is also rated on its complexity for an instructor to spot and is defined as a Level I (yellow), Level II (blue), Level III (green), or Level IV (purple) tranSition. Flyers may only learn tranSitions while being spotted by an appropriately rated instructor. For example, as part of earning an "Advanced Belly Fly" checkbox, a flyer would have to learn the advanced, Belly fly tranSition while under the supervision of a "Level III Instructor," since it is a "Level III TranSition." Once a flyer is signed off for a particular tranSition they are free to do it while under the supervision of ANY instructor.

Transitions
		BASIC		INTERMEDIATE		ADVANCED		EXPERT
						Belly-to-Belly, Front Flip		Belly-to-Belly, Back Flip
		Belly-to-Back, Barrel Roll		Belly-to-Back, Front Flip		Back-to-Back, Back Flip		COLOR KEY Level I TranSition Level II TranSition Level III TranSition Level IV TranSition While learning these tranSitions, all flyers must be spotted by an appropriately rated instructor, indicated by color.
		Back-to-Belly, Barrel Roll		Back-to-Back, Front Flip
		Back-to-Belly, Front Flip
		Belly-to-Back, Back Flip
		Sit-to-Back, Back Flip		Sit-to-Sit, Front Flip		Sit-to-Sit, Back Flip
		Back-to-Sit, Front Flip				Sit-to-Sit Cartwheel
		Belly-to-Sit, Back Flip
		Sit-to-Head, Front Flip		Head-to-Sit, Front Flip		Sit-to-Head Cartwheel
				Head-to-Sit, Back Flip		Back-to-Head, Back Flip
				Belly-to-Head, Front Flip		Sit-to-Head, Back Flip
				Head-to-Head, Front Flip		Head-to-Head, Back Flip
				Head-to-Sit Cartwheel		Head-to-Head Cartwheel