I thought this power output calculator at Performance menu was pretty interesting. I found out that the Dumbbell Bear with 30 pound dumbells produced 195K Joules. Intense! L8D1 for 15 ruonds would be 145K Joules. If you’re not familiar with Joules, that’s a lot of work being done. It’s performing at 1/5 of a horsepower for 20 minutes.