Buying multiple dumbbells mainly depends on your purpose:

I wonder if you know the concept of RM? Simply put, it is the number of times you can do it in one breath.

For example, 4RM can make four at a time under a certain weight.

In the field of sports, the research shows that: 1-5RM load training can thicken muscles and develop strength and speed; 6- 10RM load training can make muscles thick and strength speed increase, but endurance growth is not obvious; The muscle fibers of 10- 15RM were not obviously thickened, but their strength, speed and endurance were improved. During 20~30RM load training, the number of muscle capillaries increases, and the endurance is improved, but the strength and speed are not obviously improved, which is beneficial to shaping the current situation of muscles. So your choice can make the weight reach 20~30RM.

Also, as we all know, it is impossible to exercise without providing special substances for our muscles, that is, protein must be supplemented after exercise, and hydrolyzed whey protein is the best at present.

If you don't understand anything, you can leave me a message.