I believe that you shouldn't use l<span>ow intensity (light weights) if you want to build muscle mass.
</span>These types of weights won't help you much define the muscles you want to have, as opposed to free weights, weight machines, and high intensity (heavy weights) which definitely will. So if your goal is to build muscle mass, avoid light weights.
They may want to appear just as the way the bodies look in an advertisement. And if the bodies are unhealthy bodies in the advertisements then that would be a negative reaction to the advertisement.
According to the Red Cross, people who have tattoos can donate blood. It's just that they would have to wait for 5 or 6 months after getting a tattoo before donating their blood. Same thing if you get your ears pierced.
It is used to reduce pain,fever and inflammation. Also used to decrease the risk of heart disease