The former first lady says she's been hosting "bootcamps" for her friends to help whip them into shape and "be healthy together." [Snip] "When I was at the White House, I often hosted bootcamp weekends for my close girlfriends," Obama, 53, wrote. "It didn't matter that we were all at varying fitness levels. Our bootcamp weekends were a reminder that if we want to keep taking care of others, we need to take care of ourselves first."