Sit tall with legs extended, arms holding straps, elbows straight.
Roll spine down sequentially while bending elbows into a bicep curl.
Pause briefly, keeping shoulders relaxed and core engaged.
Reverse the roll up, extending arms forward with controlled tension.
Guía de Ejercicio बैक रोइंग प्रेप्स: रोल-डाउन के साथ बाइसेप कर्ल (बैठकर) - Entrenamiento de बाइसेप्स | MuscleWiki