Hilary Duff & Mike Comrie Work Out with Harley Pasternak

Hilary Duff and her husband, Mike Comrie, step out for a workout on Thursday (May 12) in West Hollywood.

The 23-year-old actress and her hubby of almost nine months worked up a sweat with celebrity fitness guru Harley Pasternak!

“Trying to train [me and Mike] today was not easy! We were troublemakers!” Hil wrote on her Twitter account earlier in the day.

Earlier in the week, Hilary and Mike hit the red carpet at An Evening of Southern Style, which supports families affected by Hurricane Katrina.