It mainly depends on what your purpose is. Know the purpose and choose your weight according to the number of times. It is recommended to start with the lightest.

The concept of the number of times in each group is very important, and the number of times is the maximum number of times that each group of dumbbells with a certain weight can complete. A group of less than 6 times is used to improve strength; 8- 12 times to increase muscle mass; 15-25 times or more for improving muscle separation and carving muscle lines; Reduce fat for more than 25 times;