This is the 13909th most frequent Polish word.
popracować
"Popracować" means "to work for a while" in English.
Here, 'popracować' is used to express the intent to work on or improve something for a specific purpose.
Muszę popracować nad projektem na jutro.
I need to work on the project for tomorrow.
In this sentence, 'popracować' describes the effort to improve one's physical fitness through activities.
Chcę popracować nad swoją kondycją fizyczną.
I want to work on my physical fitness.
Here, 'popracować' is directed as an instruction to work collectively on a particular task.