take up the challenge
To accept or attempt some particular test, fight, contest, etc., or answer an invitation or call to such. I knew it was going to be really hard doing a master's degree while working full time, but I was ready to take up the challenge. We need someone to manage our entire Pacific Northwest operation. What do you think—are you willing to take up the challenge?
take up the challenge
to respond to a challenge and do what the challenge asks. I am not prepared to take the challenge up. Dave took up the challenge without much urging.