Dr. Conrad Murray -- Approach the Bench

3/26/2010 8:30 PM PDT BY TMZ STAFF
Dr. Conrad Murray not only has a right to remain silent ... he's exercising it.

Dr. Conrad Murray

Murray was at a 24 Hour Fitness in Las Vegas last night at around 7:00 PM. He worked out for about an hour with a spotter at the ready.

As far as we know, she didn't leave his side to make a phone call.