I went for a couple of times before and it was fun. Pretty tiring as well, though. You need a lot of strength from the forearms, which are a little hard to train from usual workout...

就是希望能练练上肢的力量才打算去的.难道要先练好才能去?

Climbing is more about fun, challeges and techniques than workout. I had a climbing class before and I loved it. You don't have to be strong to have fun as a beginer.