What is the best home appliance for practicing arm strength and arm muscles at home?

The best home appliance for practicing arm strength and arm muscles at home is dumbbell. Dumbbell is a very suitable instrument for home use. It can perform a variety of actions, such as bending, pushing back and lifting sideways, and can exercise all parts of the arm. In addition, dumbbells can also be combined with other equipment for training, such as barbells and elastic belt. If you want a more comprehensive exercise, you can consider buying some multifunctional fitness equipment, such as supine boards and pull-ups.