1 . The door opens and you are amazed at seeing people jumping and flying around like superheroes. Calm down, you are not in a Marvel film, just a trampoline (蹦床) park.

In recent years trampolining has become a new craze among Chinese youths. Short videos are regularly uploaded to social media showing people’s excitement about jumping back and forth on the colorful trampolines. Most videos feature teenagers.    1    .

Ms Shi, a 28-year-old from Beijing, goes to trampoline parks almost every weekend. She said “When I was a child, I loved bouncing up and down on the trampolines, though they were just small and simple ones. They made me feel free and happy.     2    .”

It’s true that today’s trampoline parks are bigger, more professional and more creative.     3    . you can obviously jump, play in the inflatables (充气垫), or shoot basketballs like an NBA superstar. Also, if you're brave enough, you can learn to walk on the wall.

“Trampolining is so much fun. It doesn't feel like exercising at all.” Ms Shi said.

    4    . According to Robert Smith, a British sports therapist, “The trampoline pad is bouncy and absorbs a large amount of the impact of your landing, so your bones and joints are protected and strengthened at the same time.”

Unlike playing soccer, basketball, tennis or any other competitive sports, the risk of injury while trampolining is relatively low.     5    . “You must do warm-up exercises before playing. And you can't lose concentration during the movements,” Peter Cheng, a die-hard trampoline fan, who also owns a trampoline park, warned.

While outdoor activities are largely up to the weather, the indoor trampoline parks are really good places to go whenever you are seeking a fun cardio workout (有氧运动).