Jessica Simpson shows off her calves (and buns!) of steel in the ads for her new activewear line, and she looks incredible.

“Lunge your bunz into @macys and get The Warm Up by @jessicasimpsonstyle #macysexclusive,” she captioned the bootilicious shot above on Instagram. The other image was posted to her Jessica Simpson Style account, and her latest collection, The Warm Up, is "a true performance collection but a balance of fashion and function."

"Maintaining a healthy lifestyle is important to me, and fitness has been a priority in my life since having my kids," Simpson added in a press release. "Everything we do in the line comes from an organic place. It's exciting to be sharing a true performance line — it's a blend of great active features, technology and fashion."

The items are priced between $24 and $49, so they're also pretty affordable. This might explain why she's raked in gazillions of dollars on her clothes and accessories over the years -- she's figured out a brillz business model and run with it.