I, too, play volleyball. The indoor hard court isn't very forgiving to say the least. I normally sit on the floor with one foot behind me while using both hands gently pulling back on the other foot. This could be challenging if you aren't too flexible. Do deep knee bends on off days, with or without weight.
I resting one foot on the wall and pressing helps, too. You can use a jump rope and jog around after you have done light stretching.
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