Madrid have now taken 10 points and scored 17 goals in four games since Zidane replaced Rafael Benitez earlier this month. And Ronaldo insisted the turnaround is due to the Frenchman's demands for the squad to get fitter.
"The team is working very hard. In the past three weeks you've seen that with the results on the pitch," Ronaldo said.
"We needed to work harder as a team. Now we have a positive mentality. The pre-season wasn't good, there was a lot of traveling. Zizou has arrived with different ideas and we have to continue like this,” he added.