2, abdominal muscles are not difficult to practice, but it is not difficult to practice.
When life gives you a hundred reasons to cry, give it a thousand reasons to laugh.
My interest in the past has always been how to keep the perfect figure proportion. Once, 15 years old, I took off my clothes and stood in front of the mirror to see myself. Looking at myself naked in the mirror, I found that to achieve perfect body proportion, I must have a pair of arms 20 inches thick to match the rest of my body.