How come some people can work 8 hours straight and then have energy to hit the gym, but if I walk for 1 hour in the treadmil all that I can is lay down for the rest of the day?
How come some people can work 8 hours straight and then have energy to hit the gym, but if I walk for 1 hour in the treadmil all that I can is lay down for the rest of the day?