Biceps curl to both hands standing with a cable machine

Flex the elbow without letting the shoulder drift forward or the torso swing. Lower the load under control until the starting position is restored. Prioritize control over speed. Maintain useful tension through the range and deliberately reset the starting position before the next repetition.

Do not turn the final repetitions into fast or partial movements. Aim to load biceps and forearms without sacrificing position; at intermediate level, progress control first and then add load, repetitions or complexity. Keep resistance continuous and avoid letting the cable or band suddenly go slack.