Please choose the correct ending to complete the given sentence: Uncategorized: [header] How to perform the plank exercise [title] Begin on all fours. [step] If you are new to yoga or not especially flexible, prepare yourself to perform plank pose by starting on all fours. Make sure that you will be comfortable by using a yoga mat.

Ending1: [substeps] You can also move from one leg forward to the other. If your heart is racing, the plank pose can help with that. Ending2: If you are especially comfortable, you might consider having a few yoga blankets on the floor to catch you when you start doing the plank exercise. [title] Support your joints with your non-dominant forearm resting on the inside of your arm. Ending3: [title] Begin by lying on your back with your knees bent. [step] First, move up to your knees and place your hands on your thighs. Ending4: You may also place a folded up blanket under your knees if you need some extra padding for your knees. [substeps] Make sure your hands are directly beneath your shoulders and your knees directly beneath your hips.

Answer format: ending1/ending2/ending3/ending4