Forearm pump for a vice like grip.
Keep your forearms pinned to your thighs, only your wrists move.
Letting the bar roll down to your fingertips and curling it back up takes the forearm flexors through their complete range, from stretched and nearly open-handed to fully contracted. Nothing assists, your elbows are pinned to your thighs and the wrists do everything. It earns its place because grip and forearm size are built here, not accidentally inherited from pulling days.
They build the forearm flexors that close and hold your grip, especially when you let the bar roll to the fingertips and squeeze it back. Pair them with heavy holds and your grip stops being the weak link on deadlifts and rows.
Yes, that finger roll is the best part of the exercise, extending the range and training the fingers themselves. Just control it, letting the bar drop and catching it is how sets end early.
Usually too much weight moved too fast through a joint that is not used to direct work. Start light, move slowly through the full range, and build up over weeks. The forearms respond well to higher reps anyway.
