Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do gymnastics jumps [title] Find suitable surface for performing all jumps. [step] Before you even consider jumping, choose a suitable soft surface to minimize the risk of injury to your body. A suitable surface is one that is both flat and soft.

Ending1: [substeps] Consider using the floor or any flat surface you can find. [title] Lift your legs up off the ground. Ending2: Ideal surfaces include grass, exercise mats and soft playground surfaces specifically designed to break the impact of falls. Moreover, in each case you are advised to have a spotter, a person who can watch you and help if needed. Ending3: Possible surfaces (like a white wall or a very flat table) are : [substeps] Tabletop or counter top. If you practice on a white surface, you will be better off performing your jumps over it. Ending4: Gymnastics gymnastics mats are textured and easy to grip so they will do best when you're jumping. Your trampoline should also have enough floor space for the gymnastic mat you'll use, so you'll have the best chance of landing a perfect, safe jump.

Answer format: ending1/ending2/ending3/ending4