That's my motivation too! 
A lot of times, I find myself wanting to give up 15 mins into a
class, especially if it's an intensive cardiovascular class like
BodyCombat or ABT (Abs, Butt, Thighs). 
BUT, I look around and see the folks who are just like me and still
keeping at it, and I resolve not to give up. 
OR, I look around and see someone struggling more than me,
sometimes, they look at me with a look that says, "I can't believe
she can do this!" and then, because I don't want to lose face, I
force myself to persevere! 
I very ai4 mian4 zi3 one! 
