1. Climbing a giant set of stairs when you're on a date.
2. Going out jogging with another person.
3. When someone says, "Hey! It's only 30 blocks away. Let's walk."
4. Middle school P.E.
5. When you're jogging at the gym next to someone who's at their physical peak.
6. Going up to the weight scale after two weeks of working out and realizing you have not lost a single pound.
7. Putting on an outfit that used to fit and realizing it's just too damn tight.
8. Playing tag with your kids and/or nephews.
9. Getting winded after five minutes of ~sexy time~.
10. When you open the door at the wrong time and the family dog runs out.
Your dog will always be in better shape than you.