Los Angeles, California - Britney Spears is feeling fit – but it's not a diet that keeps the pop star in shape these days.

Five days ago Britney told her 28.3 million followers on Instagram that she was going to stop eating her favorite flavor of ice cream – strawberry – because she was sick of it. After eating ice cream twice a day, even her second favorites soon became boring.

Tuesday, the 39-year-old celebrity posted a new video of her dancing in black socks to Otis Redding's Sittin' On and wrote: "The last video that I posted of me dancing was from months ago ...hence why my body looks a little different in this new video !!!! No … I didn’t follow through with the ice cream diet."

Britney said that she decided to opt for portion control, which she admits can be difficult, when it comes to snacks like Doritos. "On a positive note … my body does feel way better now."

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With moves like that, she's definitely burning a lot of calories, no matter where they're coming from.

Britney also explained her unusual footwear – specifically, black socks that she had rolled up to the tips of her toes. Apparently, she's been getting blisters from all the dancing on the marble floor and her feet are all taped up. The socks are covering up the sore spots.

Britney Spears has recently been getting a lot of renewed attention since the release of the new documentary Framing Britney Spears. The star even got an apology from Justin Timberlake. Maybe that's another reason she's feeling good?