Teri Hatcher, 55, shocks fans with bikini photo after fitness challenge

Teri Hatcher is marking the end of an intense fitness challenge by showing off her new, very muscular figure in a bikini shot posted to Instagram.

For the past eight weeks, the actress, 55, has been participating in the popular F45 training program, which offers high-level, functional, high-intensity workouts through team exercises to help members transform their bodies. To give you an idea, participants aim to burn 750 calories in just a 45-minute gym session.

For Hatcher, it wasn't just the physical transformation that mattered, but the mental one as well.

【ギャラリー】Teri Hatcher out and about in recent years25

"Exercise has become a source of well being not a means to look good naked. As part of my @f45_training 8 week challenge we had to submit an after photo. So why actually post a pic of myself in a bikini? Well, this is my truth and being in this 55 year old body actually feels liberating," the "Desperate Housewives" star wrote on Instagram. "I've finally figured out how to be comfortable in my own skin."

The mom-of-one added that being vulnerable enough to share her journey is a challenge that requires much confidence, but it's also necessary for growth.

"Sharing myself in a bikini (which I may or may not ever wear again) Is me Being open to others, open to life... finding glorious connection and community. No filters, no makeup, no airbrushing, no negativity. Be strong enough to be vulnerable," she wrote.