A forearm and grip strengthening exercise where you hold a barbell behind your back with an underhand grip and curl the bar upward using only your fingers and wrists. Keep your arms straight and shoulders relaxed while focusing on lifting the weight through finger and wrist flexion. Lower the bar back down with control. This variation targets the deep muscles of the forearms and improves grip endurance and wrist strength.
Log your dumbbell behind back finger curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.