1-Do not listen to it if you are under 18.
2-Make sure there is no heart disease.
3-Don't listen to it if you are easy to get shocked.
4-You don't have high Blood Pressure Disease.(Hypertension)
5-You don't have Sugar disease.(Diabetes)
6-Don't eat or drink during listening to it.
7-Make sure all the windows and doors are opened in the case of having suffocation.