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And by kicking it, there's no relaxation involved!

Actress Jaime Pressly took advantage of all The Muscle Milk Fitness Retreat's Beach Week had to offer ... including a private Everlast boxing session with Jarett Del Bene.

The My Name is Earl star keeps her body in fine form with regular workouts at least 3 - 4 times a week ... while wearing her Polar Heart Monitor to keep track of her calorie count. We wish we looked that good while wearing C9 by Champion gear!

Jamie will be starring in a new series this fall called Hate My Teenage Daughter. Find out which exercises she focuses on ... after the jump.