In this Corner ... Lindsay Lohan

6/12/2010 4:10 AM PDT BY TMZ STAFF
You gotta hand it to her ... Lindsay Lohan is trying hard to find ways to fill her days.

Lindsay showed up at at "Muscle Milk Light" women's fitness retreat yesterday in Bev Hills. 

Kind of ironic ... since she's suing over that whole "milkoholic" ad thing.