Well, this is rather embarassing. But, when I am walking or jogging on the treadmill, when I get tired, I say "I will not be too fat to get on the ride".
That doesn't mean anything to anyone but me.
Last year, at Dollywood, my then 8 year old wanted to get on a ride with me. I got on it, and they couldn't close the lap bar. I had to get off.
And, I am overweight, but not considerably so! I was 199, and a size 16 at the time.
Man, was THAT embarassing. Nope, that won't happen again.