Sitting on it won't explode. The quality of fitness balls varies, and the price ranges from tens of yuan to more than one hundred yuan. You can buy it in general fitness equipment stores. When buying, you can choose fitness balls with diameters ranging from 60 cm to 100 cm according to your body. Fitness balls are mostly made of vinyl and filled with air. When selecting, we should first look at whether it is made of vinyl, then check whether its appearance is round and damaged, and then check whether its elasticity is appropriate and its load-bearing capacity is appropriate. The average fitness ball can bear more than 200 kilograms at most.

Playing fitness ball for a long time can also make fingers, palms and wrists flex flexibly, promote the movement of upper limb muscles such as fingers, wrists and elbows, and prevent and correct symptoms such as numbness, trembling and decreased grip strength of upper limbs caused by degenerative diseases. Moreover, hand movements are also very beneficial to the brain. When people play fitness ball, they can concentrate their thoughts on their hands, eliminate all kinds of distractions, eliminate tension and relax their brains. Playing fitness balls regularly can also effectively protect the brain, slow down the aging of the brain and avoid the occurrence of Alzheimer's disease.