The Gunnar Challenge offers new workouts every day, a meal plan and daily 'verbal vitamins,' which are a motivational video or workout tip. The thing that really makes the program work is the forum, where Challengers can communicate with each other and with me.

In the old days we were the challenger brand competing against the big banks, but today I go round the world and I sit with governors of central banks and finance ministers and, in some cases, prime ministers. They all know Travelex. We are regarded as the establishment - the world's largest retailer of foreign currency.

We call the fates of the Titanic and the Concordia - as well as those of the space shuttles Challenger and Columbia - 'accidents.' Foreseeing such undesirable events is what engineers are expected to do. However, design trade-offs leave technological systems open to failings once predicted, but later forgotten.

I spend my money on cars. That's why I have a Challenger. It's a muscle car, like a Mustang. It's big and rumbly.

I have a blue 2010 Dodge Challenger SRT, the first car I ever bought. I didn't want it to just be a regular Challenger. I wanted it to be different. So I sent it out to Richard Petty's garage in North Carolina, completely tricked it out - a one-of-a-kind built for me and we changed the name of it from 'Challenger' to 'Champion.'