1. I can't keep up with the food. Is there not enough food and nutrition? There is not enough protein to provide nutrition for muscles. I should add more meals or eat more.
2, practice too many times, the weight is too small, generally a group of 8 to 12, when you do this, you will have no strength. Do you use small weights many times? At this time, you should increase the intensity of training and stimulate muscle growth with large weight.
According to my analysis, there are two possibilities. See if you are like this.