Or it may be a place for those de-orphaners who want an extra challenge.

That is an extra challenge, compared to those who have car support.

There is nothing like an extra challenge to keep the mind sharp and the solving interesting.

For an extra challenge, do the chest press with your head and upper back on an exercise ball.

If you're already fit, you can add dumbbells for an extra challenge.

Doesn't seem like much, but it brings some extra challenges.

There are two levels (easy and hard) to add an extra challenge to the game.

It's an extra challenge to explain what we're all about.

If you want an extra challenge, close one or both eyes.

For an extra challenge, raise your arm and/or the top leg.