42 reps in the Grenade Thermo Detonator: Dumbbell Curl and Press Challenge on br About this challengebr With alternate arms, curl and press a 16kg Dumbbell, keeping legs locked, and only allowing slight torso movement to 'cheat' curl the weight. No putting the weight down, no resting it on your legs, no bending legs to create movement, no wraps allowed (lifting gloves are fine) and no assistance from anyone else. Arms must be fully extended during the press.br You're a member of this challenge.