Did someone recomment crossfit for you? It looks to be police academy type training and a typical course of exercises. squats, push ups sets, etc. Does your doctor think this is a good idea? I'd love to hear more about how you're treating your Atrial Fib.

Here's the link I found: http://www.crossfit.com/cf-info/what-crossfit.html

Crossfit is a combination of olympic weightlifting, cardio, push ups, pull ups, squats, sit ups etc. It is a pretty inclusive fitness program. It can be really strenuous. It is usually set up in a competitive form (ie. workouts done for time or for the maximum number of reps). You can definitely go at your own pace though because the last thing they want is for you to get injured or over exert yourself to the point of passing out. I highly recommend it but you definitely have to listen to your body. I'm not familiar with a-fib so I would consult a doctor before doing a program like this. Best of luck to you.