Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a flip turn (freestyle ) [title] Start your turn when you see the black t on the pool floor. [step] There is a black line at the bottom of your pool lane. The perpendicular line lets you know that the wall is two feet away.

Ending1: Finally, to enable the flip, you'll know that the wall is wide enough for your flip and that you're facing the wall. [title] Do the flip-turn [substeps] Switch positions to keep the alignment as straight as possible. Ending2: You can use the black t to let yourself know it's time to start executing your turn. [substeps] This can be hard to judge because it all depends on the length of your legs. Ending3: No one will be able to see your turn unless you are standing close enough to the wall to reach it. [substeps] Standing slightly away from the wall, stand your behind while you hop over the rail. Ending4: When you see this line, push your rear blinker to turn. The rear blinker's warning is ticking.

Answer format: ending1/ending2/ending3/ending4