You should be standing wrong, because your physical condition should be enough. Since the strength of the upper and lower limbs is ok, it is the strength of the buttocks. Personally, I think the stability of the footwall depends on the buttocks. If you look closely, you will find that big butt is very popular inside, whether it is around you or NBACBA. There's no need to squat or anything. It's all a bluff by the fitness instructor. We ordinary people just ride bicycles! When I was a child, I went to school by bike. The village is only two years away from the school 12 km. My ass is hard and strong, which is very important for men. I started the school team when I was in junior high school and high school. The position is No.2 and No.3, which is purely personal. I don't like it, so don't spray it.