Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a side to side reach with an exercise ball [title] Put your exercise ball in an open area. [step] You should have plenty of free space to move around, and all sharp/heavy objects should be removed so as to minimize the potential for accidents. [title] Sit down on the ball with your legs pointing ahead of you, knees bent and feet on the ground.

Ending1: [title] Lift a free foot up and place it behind you. [step] Lean the lower part of the foot against the ball, lifting slightly toward your body. Ending2: [title] Lift your arms into the air at shoulder height. [step] Try to keep your wrists down the whole time. Ending3: [step] Walk yourself forward slightly but don't fully lean back against the ball. With your arms resting at your sides you should now be in a neutral position. Ending4: [title] Place the ball of exercise ball in between your feet (width apart) and place your arms on either side of your body. [title] Lift your legs to close the exercise ball.

Answer format: ending1/ending2/ending3/ending4