To keep your tummy flat you need to keep your back strong too as the band of muscle around your waist also helps support your spine.
想要保持腹部平坦，同时你也要保持背部强壮。
2
If you are small size, the spotter can actually support you at the waist level.
如果你是体积小，检举实际上可以支持你的腰部水平。
3
Distinctive modelling design according to the design of principle of human body engineering arc shape, can perfect joint your waist, give your body good support.