The players trained in Shanghai for the first time on Tuesday morning local time.
It was a tough session in the heat with rondos and running the order of the day at the Yuanshen Stadium in this bustling Chinese city.
Having toppled Juventus 3-2 in a thriller in Singapore on Sunday, Manchester United are next up in the International Champions Cup (ICC) at the Hongkou Stadium on Thursday (12.30pm UK, 7.30pm local).