CrossFit, which was founded in 2000, is a training program that aims to enhance strength and aerobic conditioning.
It brings together all types of people to improve physical well-being and cardiovascular fitness.
"In 2009, I had back pain for a long time. I tried many types of therapy, but nothing worked. My friend said, ‘Try tai chi, it is a gentle exercise.’ I refused at first because my back was sore, but eventually I tried it." It helped relieve my back pain.