So, the next phase of my workout(Hypertrophy II of New Rules of Lifting) involves the Towel Bicep Curl. It consists of holding two dumbbells centered in hand towels, then curling them.
Useful exercise?
Yeah. It will absolutely kill your forearms.
Gripping bar is easy, trying to keep a tight grip on towels is quite a challenge.
Wrap the towels ends around your hands, massive forearms can come from pull ups and chin ups, at least thats what I do.