Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to perform a back dive with a half twist [title] Walk to the end of the board, watch the water behind you (this is optional), and turn your back to the water. [title] Stand on the balls of your feet. [title] The first times you try this dive, start with your arms straight above your head and close to your ears.

Ending1: [title] Make sure your arms have a straight line between them for stability. [title] Bring your arms back to your sides. Ending2: [title] The next time you practice a half twist, put all your weight on your outside foot to lift your arms forward. [title] The second time you try this, don't lose your balance or tap your feet. Ending3: [title] The second time you try this dive, go out to a t-bend, as low as your back will go, and knock off the board, throwing you back to your starting position. [title] This time come back to the bottom. Ending4: [title] Drop your arms to your sides while bending your knees. [title] At the same time, swing your arms back up to your ears and push off the board.

Answer format: ending1/ending2/ending3/ending4