1, 1 month is too short, your psychological expectation effect is too great, and you don't feel much.

The dumbbell you use is very light. The average adult should have at least a pair of 30KG dumbbells. Only in this way can we stimulate muscles, especially exercise large muscle groups, such as lifting and squatting. Generally, you should be able to do 10 when you can't do any action. About the same weight. When practicing, you can do 6-8 at a time.

3, the usual living habits and nutrition have not kept up. If you exercise your muscles without rest, your muscles will not grow.

Generally speaking, practice at least once every other day, but you must practice for more than half an hour at a time. I feel that the part you want to practice is a little sour. If you're not interested, just practice a few more times, and it won't work.

Check it yourself. I wish you success!