Gymnastics crossword:

bringing your knees up to your chest while jumping
balancing on your hands with legs and feet in the air
using your arms and core to hold you up in a push-up position
straightned legs, using your arms, legs and core to hold you up with stomach facing the ceiling
balancing on your buttocks, with the rest of your body in the air
feet wide apart, with your front leg bent, and the back leg straightened
laying on the ground, with legs pointed vertically
to sit with legs parted outwards. this can also be done in a jump
arms and legs supporting you, as you push up into an arch-shape, with belly facing the ceiling
to sit with legs stretched out on either side of your body