The new must-have workout accessory in Beijing is a face mask. The sounds of pulsing music and crashing weights have returned to some of the city's gyms, after being closed for nearly three months. Only above-ground gyms are allowed to operate. Temperatures are checked at the door and names and contacts noted. Everyone must wear a mask unless they have difficulty breathing and maintain a distance of around six feet. Mi Fitness gym is subject to three spot checks a day from the city's sports authorities. Any breach of the rules could result in it being shut down. The gym says the re-opening came in the nick of time. Mi Fitness is a members-only gym and members sign up for classes with a personal trainer. But it's now letting people who want to work out on their own use the facilities, as many other gyms nearby are still closed. Although restrictions in China have eased, many people are still working from home and also looking after their children, so businesses are taking time to get fully back up and running.