Resisted little finger adduction with therapy putty (Finger (little) adduction strengthening, with putty, palm down)

Sit upright in a chair.
Place the putty down flat on the table.
Place your hand, with your index, middle and ring fingers together but little finger apart over the putty.
Keep your wrist and forearm flat on the table.
Try to squeeze the putty bringing your little finger into your ring finger.
Keep your other fingers still throughout the exercise.