Here is another short and intense Kettlebell / TRX metabolic circuit that you can try as well http://community.fitnessanywhere.com/blogs/mfp_interviews/archive/2008/10/02/trx-kettlebell-fusion-workout.aspx

I tried out a new fusion workout yesterday and thought I was going to puke at the end. Three sets for time (one set is a complete circuit, rest 2-3 minutes between sets). Hand-to-Hand KB Swings: 10 each hand (swing with the right, release at apex, bring back down with the left, repeat) Suspended Lunge...