Band elbow extension
Prerequisites are standing hip hinges: https://www.youtube.com/watch?v=aKtUTU5l1vk
and band linear rows: https://www.youtube.com/watch?v=4IQcwG82fbk
Progress to band tricep extension overhead: https://www.youtube.com/watch?v=YvavnAEfacw
or dumbbell tricep pushbacks
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