Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to string a crossbow [title] Know when to use this method. [step] This method requires you to use more arm strength and is easiest when done on crossbows with a lower draw weight. [substeps] Your weight and strength will also determine how easy this method is.

Ending1: If your arm strength is 90% based on strength alone, you will be able to thread your crossbow with a high draw weight. If your strength is 35% based on your range of movement, make it 15 to 20 strong forearm muscles. Ending2: While in general, these crossbows shoot up to 170/ 220. However, as they are more adaptable and more expensive, any higher pull action can take it to the limit. Ending3: [title] Loop the string twice across the way. [step] Stand with your front arm straight and your back straight. Ending4: You will need to apply more force when using this method, so the heavier and more muscular you are, the easier it will be. Note that this method cannot be used on a compound crossbow with a pulley at the end.

Answer format: ending1/ending2/ending3/ending4