Think fat exercise has no effect.
You can raise your hand and do a simple action, open your five fingers and raise your hands above your head for a few minutes.
Doing more hand stretching exercises can promote blood circulation in the hands, which is very useful for thin hands.
Pay more attention to your diet. Usually you can eat more fruits and vegetables and less greasy things.
You can massage your hands at rest. With Heana, you can watch TV and be thin-handed.
I hope these simple methods will help you.