On average, the fastest your heart should beat per minute is 220 minus your age. 

But ideally, vigorous exercise is between 70 and 85% of your maximum heart rate.

 Exceeding your maximum heart rate can result in dizziness, chest pain, or even fainting. 

So listen to your body and don't push your limits. 

When you want something badly, it's hard to know if or when to throw in the towel. 

So, we push the limits, hoping if we put in a little more time, more effort, maybe it will all work out. 

Or, you could crash and burn, taking everything you love down with you.

 But you won't know until you try.