Barbell wrist curls are the simplest way to train wrist flexion strength for both grip and stability.
 
 
Execution
 
With a barbell in a supinated grip, squat partially and rest your forearms on your thighs at an approximately 45-degree angle. Extend the wrists completely, then curl them into full flexion with a controlled tempo to minimize momentum. Return to extension under control. You can allow the fingers to extend partially and the bar to roll down them in the bottom for added finger flexion and grip strength work.
 
 
Purpose
 
Barbell wrist curls strengthen wrist flexion for general wrist health and stability and strength for supporting weight overhead.
 
 
Programming
 
Do 2-3 sets of 10-30 reps at the end of a training session 1-3 days/week.
 
 
Variations
 
Barbell wrist curls can also be done behind the back with the arms hanging straight and the palms facing backward, but this limits the range of motion.