Lie on right side, keeping back straight and neck supported with right hand as shown.
右侧卧，保持背部伸直，右手像图示一样支撑颈部。
Standing with feet shoulder-width apart and cradle baby with both arms. Keeping a straight back and repeat deep knee bends.
双脚分开与肩同宽，双臂抱着婴儿。保持背部挺直，重复深膝弯曲。
Bend the front knee, keeping the back leg straight, press the right heel down on the floor.
前腿膝关节弯曲，后腿保持绷直状态，右脚后跟贴紧地面并向下压。
Keeping your back straight, push up with your arms until your arms are extended.
保持背部挺直，向上推你的手臂直到手臂伸直。
Bend forward slightly at the hip, keeping your back straight, until you feel a slight stretch in your hamstrings.
保持背部平直慢慢俯身，直到感觉腿筋拉紧。
By keeping a straight back, you help prevent injury.
保持背部挺直，可以预防伤害。
Lie on your back and lift both feet together into the air, keeping your knees straight.
后背着地躺下，把双脚并拢伸到空中，保持双膝直立。
Squat down as low as you can, keeping your heels on the ground and your back straight.
深蹲至最低位置，脚跟贴紧地面，背部挺直。
Let the baby lie face down on the bed, keeping the back straight and relax.
让宝宝俯卧于床上，背部保持平直，放松。
Hold the front of the fingers with the other hand. Keeping fingers straight, bend the wrist back until a definite gentle stretch is felt in the forearm and wrist.
另一只手握住该手手指并向手背方向伸展，直到前臂和腕部有适度的牵张感。
Plus, keeping your back straight and transferring your weight forward will make it easier to get the return deep in your opponent's court.
除此之外，伸直后背，把重心前移，可以使你更容易地把球回到对手的后场。
Plus, keeping your back straight and transferring your weight forward will make it easier to get the return deep in your opponent's court.
除此之外，伸直后背，把重心前移，可以使你更容易地把球回到对手的后场。
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