They keep you alive
It keeps you in shape
It can help you be strong and not do addictive things
This question depends on the person. Usually by around 200 to 210, your heart begins to go into an abnormal rhythm or disrythmia, called VT or PVT. The respectively, stand for Ventricular Tachycardia and Pulseless Ventricular Tachycardia (PVT is the more dangerous variety). At around this stage a patient runs the risk of cardiac arrest, which is dangerous because while the heart continues to beat, the contractions are so fast, blood isn't being let into the chambers of the heart. Without blood actually being pumped, the person is unable to perfuse, and goes into shock, seizure, coma, and then death.
Answer:
Well if you miss someone then tell them you miss them, even if its an ex boyfriend or an ex bestfriend. But the one thing you dont want to do is go through the pictures you have with someone or the person you miss because that will hurt like s***. And hun the world is not against you, I felt this was once before and i looked through pictures and it really hurt so dont do that and I know youre strong enough to get through this even if i dont know you I know you can get through this. Just take your time with things and surround yourself with people you love and that makes you feel happy and do the things that make you happy with the people that make you happy. If you need to talk I'm here it will be okay, trust me.