Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to buy an exercise ball [title] Choose an extra-small ball if you are up to 5' (152.4 cm) tall. [step] Exercise balls are available in different sizes, based on the diameter of the ball when fully inflated. The correct ball size is selected based on your height.

Ending1: [substeps] Incorporate more commonly used materials for maximum capacity and dimension when shopping for a new exercise ball. [title] Purchase an inexpensive exercise ball if you are taller than 5'2 " (16. Ending2: [substeps] For example, if you are 5'2 " (122.4 cm) tall and weigh 152.4 lb, you'll need a heavy ball. If you are 5'4 " (122.4 cm) tall and weigh 152.4 lb, you'll need a small ball. Ending3: So if you are under 5', the extra-small ball with a diameter of 45 cm (17. 7 in) will probably work best for you. Ending4: [substeps] Consult a physical or hobby store if you are concerned about what size ball to buy. [title] Pull the ball to your belly to inflate it.

Answer format: ending1/ending2/ending3/ending4