My reply doesn't go along with all the rest in that it doesn't envolve motivational speakers or anything.
The strange place I find my motivation is in a song. Not that strange, others find motivation in a song, but mine was in an N'Sync song. (And no I am not a fan at all)
I believe the name of the song is "It's gonna be me". They are talking about love, but I think of the lyrics as weightloss instead.
Here's a few lines that get me going....
".....Every little thing I do
Never seems enough for you
You don't want to lose it again
But I'm not like them
......Guess What??
IT'S GONNA BE ME!!
It really gets me pumped. Sure I've lost weight in the past, but this is the last time. I don't want to lose it again. And in the end I will be the me I want to be!!!
Maybe corny but it gets me going.