Sit on a bench in front of a Smith machine with your forearms resting on your thighs and wrists hanging over the edge. Grip the bar with an underhand grip and curl your wrists upward by flexing at the wrist joint, squeezing the forearm muscles at the top. Lower the bar back down with control and repeat for the desired reps.
Log your smith seated wrist curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.