We don't at the moment, but here's one where you can go for either 3 or 5 minutes: http://brinsonwellness.com/?p=4954.

I especially like the fact that it highlights the core muscles that are strengthened.

TBH, even the three minute is more aggressive than I can do. So I'd start with 10 seconds, if that's where somebody's current level is, and more slowly move up--like, at a 90 day pace instead of a 30 day.