The classic series where you flow into Plank, down to Chaturanga, into Upward Facing Dog, and then push yourself into Downward Dog is one of the absolute best for building up the strength in your arms
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Chaturanga Dandasana
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Many of the postures that people perceive to be good for building up arm strength, such as arm balances and other straight-arm postures, are actually not the most beneficial
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Downward-Facing Dog
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I love this pose for accessing arm strength because it works in a unique way when compared to most other postures. In Downward-Facing Dog, you’re pushing the floor away from you, attempting to offer more weight into your legs
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Yogi Pushups
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This one usually gets a lot of groans when it is offered in a yoga class, but it is one of the best for arm strength. In a yogi push up, you will start in Plank position, placing your hands directly under your shoulders
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Plank
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All this will enhance your arm strength-building efforts. Make sure you are actively hugging your arm muscles in towards your arm bones in this posture rather than dumping all of your weight into your joints