Doing the frog on the bed may cause muscle and ligament strains. The bed to do lying frog action should be gradual, standardized action, angle and exertion of force should be gradually increased, can not be excessive pursuit to achieve the standard posture, otherwise it is easy to lead to leg muscle strain, serious cases may also lead to ligament strain. For lying frogs in the operation of the correct premise, practicing is the degree of stability and flexibility, stretching the inner thigh ligaments and muscles, daily adherence to help exercise the leg muscles, to help increase the strength of the legs, to enhance physical fitness. It should be noted that, for people with lumbar spine or hip diseases, should first go to the hospital, for the appropriate treatment of disease, do not blindly try this kind of action.