Biceps curl with dumbbells on an incline bench

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. Make sure the bench is stable and that the shoulders, pelvis or feet do not shift during the set.