Someone already asked this question and someone else answered it so here's their answer.
The primary stress hormone Cortisol increases the blood supply of sugar (glucose), enhances the use of glucose by your brain and increases the availability of tissue - repaired materials.
Joints in both the skull and in the elbow move. however if you break a join in your elbow you will most likely survinve. if you break one in your skull you have a higher chance of death then you would if it had been your elbow.
The talk test is a one of the easiest ways to monitor your exercise
intensity. You don't need any equipment, like a heart rate monitor.
All you really need is the ability to talk and breathe.
Whether you can do both at the same time is where your intensity comes in.
