Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to do a hollowback handstand [title] Warm up your shoulders. [step] Do 30 seconds of forward arm circles and 30 seconds of backward arm circles. [title] Warm up your wrists.

Ending1: [step] Press them out into a' v' shape. [title] Flex your wrist up to your shoulder. Ending2: [step] Do 1 arm circle on each side of your body. [substeps] Warm up your wrists fast with a warm up stretch. Ending3: [step] Once you have warmed up for at least thirty seconds, take five to ten deep breaths, then immediately tense your hand. [title] Get stiff stiff, then swing your arms loose and do half arm circles. Ending4: [step] Do 30 seconds of wrist circles in both directions. [title] Warm up your hamstrings and back.

Answer format: ending1/ending2/ending3/ending4