Stand facing a Smith machine with the bar positioned behind you at about hip height. Grip the bar with an overhand grip and keep your back straight. Curl your wrists upward by flexing them, squeezing the forearm muscles at the top of the movement, then slowly lower the bar back down with control.
Log your smith standing back wrist curl sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.