I liked the Red trainer. She ruled. These people have gotten where they are over a period of years and years. She has to be intense. She only has a few weeks to change all of these horrible long-standing habits. And she's hot too. And she's not too skinny. Her arms were very well defined and muscular. She just looked really thin because her waist was so lean.
Also, I think the "temptations" are reasonable. First, it makes for good TV. Come on, we all know we can't have a show that's 100% uplifting. Viewers will get bored. Making them do bake sales and stuff provides more drama, and like dvm and lambkins said earlier, is more indicitive of real life. How many of us work in offices where every other day someone brings in a plate full of donuts/brownies/insert artery-clogging item of your choice? These contestants need to learn to say "no" all the time.
I like the curly headed guy with the woman boobs. Those were a little scary. I had to turn away from the TV! But he seemed really cool and would have a huge upside. I also liked the guy who ate the donut at the begining. I did NOT like the woman who kept crying and going psycho about "I don't know what to eat!" GEEZ its not that hard! Eat lean chicken! Eat salads (no dressing ,bacon, cheese, etc - this isn't Arbys)! Eat tuna and vegetables and wheat bread and fruits and lowfat cottage cheese. Don't eat brownies. Its not rocket science.