If we could assume:
- We don't increase our energy from absorbing food.
- Our human example in scope isn't starving or suffering from malnutrition.
I mean how much work can we do until the body would die from exhaustion.
Sometimes when we work out, we have this sudden 'burst' of energy. Where does this energy come from, and how long, biologically are we capable of converting this energy to the various forms of energy we expel from our bodies: heat, mechanical, etc..