To put it simply and rudely, the big aspect of physical change is diet+training.

On the premise of strength training, muscle building generally means that fat muscles go up together and fat muscles go down together, but in different proportions.

This is closely related to the difference of heat gain and loss and training intensity.

Increasing muscle and reducing fat are all about changing diet under the premise of strength training.

Muscle building is nothing more than the product of increasing strength and dimension, and it is a gradual load training (which can be changed by increasing the total training volume, increasing the training weight and reducing the rest between groups). ) and excess heat.

The same is true for reducing fat. I just want to lose muscle and strength. Highlighting lines is the product of strength training+heat difference.

Why do you want to do aerobics when you lose fat? Because when you do strength training during the fat-reducing period, you generally need to reduce the intake of sugar (sugar is closely related to strength training, which will affect the training spirit and performance), so the strength will decline, the sports performance may decline, the training volume will be reduced, and the loss of heat difference is not enough, so you can replenish muscles through long-term aerobic, and it is not difficult to provide fat directly with low-intensity aerobic, or high-intensity HIIT can preserve muscles to the maximum extent even if it is very tired.