One of my fave shows is Surviving the Cut on Discovery Channel. They delve into what it takes to make it in the military elite. This week they focused on the Navy's Explosive Ordnance Disposal crew. They are highly trained technicians who analyze and handle explosives.
I bet you're thinking, "Great, what does this have to do with me?"
You want your dream? You gotta learn from the finest go-getter's ever. Every day they give 100% because they know if they slack there are no do-overs. Navy EOD's are relentless- they continue on despite physical exhaustion. The key to their success is to shift their mental focus. Having a bad day? Clear your mind. Forget about your tiredness, hurt muscles or etc.
Stretch yourself as hard as you can- the end result will be worth it.
PS- If you want a more in depth look at the Navy EOD crew, watch The Hurt Locker. Please note the movie is pretty intense and not for everyone.