Biceps, Forearms
Watch Tutorial
https://www.youtube.com/shorts/jq1wXsAvdeQ
https://www.youtube.com/shorts/kE1JBOgN678
https://www.youtube.com/shorts/SyHdtckD4hY
Stand tall, hold DB each hand, arms extended, palms facing body.
Curl DBs up, supinating wrists (palms up).
At top, rotate wrists to pronated (palms down).
Lower DBs slowly with palms down.
At bottom, rotate wrists back neutral.
Repeat.