They had some pretty challenging questions, like how could you do that to your body.

Add nonstop action to the mix, and you've got the makings of a pretty challenging task.

"It gets pretty challenging with a toddler in the car," she said.

He lights up the screen with his dancing in particular, pulling off some pretty challenging dance moves.

In response, he asked members to appreciate the "tough and pretty challenging" schedule exerted on the project.

As the highest bid is 25, it's a pretty challenging game, but also a fun and gratify intellectual challenge.

"It's definitely made a difference in my thought process and definitely has helped me through some pretty challenging times this year," he said.

I tried the fold-it program a year or two ago, and it was pretty challenging.

Some days it's pretty challenging even to just get up.

"I think they're going to hear stuff that would be pretty challenging, pretty emotional and intense."