Can abdominal muscle training, a lazy man who sells online, really develop abdominal muscles?
Yes, you can. I work out in the gym and have a personal trainer, so I have an abdomen machine to exercise. The tummy tuck in the gym is called a roller coaster tummy tuck online, which can be equipped with different weights, much better than hundreds of online ones. However, it seems that the main thing is to exercise the lower abdominal muscles, and the upper abdominal muscles still need to be exercised by themselves.