A buddy emailed me this from the NYT: The 9-Minute Strength Workout
My opinion: That is not a strength-building workout but it isn't a bad simple calisthenic workout for those who must exercise on their living room floor and have no access to fun calisthenic toys like kettlebells, heavy balls, pull-up bars, jump ropes, floor ladders, step-up boxes, etc.
Still, I'd say that that circuit repeated for 45 minutes would be an ok calisthenic workout. 9 minutes is nothing. Calis do not build strength but they certainly help maintain vigor. In other words, 45 minutes of that is a heck of a lot better than sitting on your ass.
We stand by our recommendations: Resistance + Calis + Cardio for overall fitness for life.