struggle

"The yoga instructor guided us through a series of back contortions to improve flexibility. "

"They are going to try climbing Mount Everest themselves."

"My brother constantly helps his younger sister with her homework, demonstrating his steadfast loyalty and support. "

"During the centuries, the people of Ireland struggled constantly to assert their right to govern themselves."

"The difficulty of the math problem made it hard for many students to solve it. "

"The ancient pyramids have stood for centuries, witnessing the rise and fall of civilizations. "

"The contortion of his body as he tried to reach the high shelf was quite impressive. "

"My little brother practiced his handstand in the park. "

"The contention between the siblings over the last slice of pizza was quite loud. "

"The complicated instructions on the new software difficult me from completing the project on time. "

"The gymnast performed a perfect handspring before landing smoothly on the mat. "

"an impressive movie"