Muscle outlines from Body Muscles by Ivan Vulović, Apache 2.0 — regrouped and recoloured for Muscle Train.
Select the desired weight, load it onto the bar, and assume a seated position with the forearms resting comfortably on your thighs. Utilize a supinated (palms up) grip and curl the bar towards your body using just the wrists. Once the forearm flexors are fully shortened, slowly lower the weight back to the starting position. Repeat for the desired number of repetitions.
Using a slow eccentric (lowering portion) of the exercise can help to improve tension and mind muscle connection. Try not to open the fingers at the bottom of the movement, just move through the wrist.
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