The Biggest Loser

I'm watching the biggest loser right now, and you know what I don't get? I don't get the contestants complaining about things like "oh, my feet hurt, my ankles hurt, it's hot" blah blah blah. I'm fat and I know it, if I started working out like crazy for hours & hours each day in the middle of the summer, I would EXPECT the pain. Some of the contestants are just, weak. I just want them to shut up with the complaining.