09/02/2011 AT 10:00 AM EDT
's Jenna Ushkowitz
is staying in shape for season 3 of her show
. The actress
worked out with a personal trainer at Equinox
Hollywood, and she looked cute in a pink tank top and black leggings.
According to a source, she had a great attitude and was laughing during her
exercise regimen, which included using arm weights and jogging in place.