RATHER, I'm not familiar with Dr. Daren and I could be off base here but did you mean Dr. DARDEN?
Elliott Darden, now Dr. Darden, was a promising bodybuilder many years ago who becme somewhat famous due to an article written about his training method of sitting in a large tub of mud and doing 'resistance' exercises.
Sounds crazy and there may have been more to it, but that is all I can recall right now.
I tried to find some photos of this mud in the tub routine but all I could find is the shot below. But that is not a photo of Dr. Darden but it's an interesting shot as I was never aware that such events were being conducted.