Two local sisters from Sarasota have created a perfect fitness routine to help you hit your goals. Build & Burn is both an app and a website created by third-generation Sarasota natives Ashley and Amanda Rosenberg.

It offers weekly workout plans and an extensive on-demand video library to help subscribers craft a sustainable and effective fitness routine. The sisters, six years apart in age, were raised in a fitness-focused household. Their mother was a professional tennis player and their father a lifelong workout enthusiast. From a young age, Ashley and Amanda developed a passion for health and fitness. Ashley, the elder of the two, captained her Division II college tennis team, while Amanda played club tennis at a Division I school. Both earned degrees in Business Administration and eventually found themselves working for the same real estate company after college.

It wasn’t long before coworkers began asking them for fitness and nutrition advice. The sisters started sharing healthy meals and free workouts on Instagram through their page, Rosey Times Two. As demand grew, they began designing their own workout programs focused on building muscle, burning fat and creating a balanced routine. They became ISSA-certified personal trainers and, in 2020, launched their first PDF-only workout guide—sparking the beginnings of what is now a thriving fitness platform. Today, Build & Burn has over 200,000 followers and is a tried and true platform for accessible, effective fitness programs. The monthly subscription includes a curated workout schedule designed to hit every muscle group in just 30 minutes a day, four days a week.

“Amanda and I created this program to help people build a sustainable, well-rounded fitness routine,” says Ashley. “When I was in the corporate world, I was spending six or seven days a week at the gym, often for over an hour. But once I became a mom, that just wasn’t realistic. Our program focuses on short, effective workouts you can do at home with just a couple of dumbbells.” Ashley, now a mom of two, became certified in pre and postnatal fitness after the birth of her first child. Her pregnancy program, available on the Build & Burn platform, guides moms through all stages of pregnancy and postpartum recovery with safe, effective workouts designed for real life. Recently, Ashley’s real-life challenges put the system to the test. In 2023, she and her family lost their home in one of the hurricanes and had to move five times. “Even with all of that chaos, I was still able to stick to my workouts,” she says. “That’s the power of having a 30-minute, do-anywhere routine.” While Ashley handles more of the finances and operations of their company, Amanda focuses on marketing. Together, they also collaborate on creating recipes for the app, working with registered dietitians to deliver easy, nourishing options—from high-protein meals to delicious smoothies. 

Build & Burn is designed to grow with you, offering programs for every fitness level and life stage. For beginners, there’s a four-week, three-day-a-week starter program. From there, users can transition into weekly challenges that progressively build strength and endurance. For moms, there are workouts designed to be completed during nap time or even with little ones crawling nearby. “Our feedback from moms has been incredible,” says Amanda. 

Even their once-skeptical parents are now fully on board. “At first, they weren’t thrilled we left our corporate jobs to start a fitness business,” says Ashley. “But six years later, our mom is doing our workouts every day.” With your subscription that can be cancelled at any time, you get access to weekly curated workout plans, beginner, prenatal, and postpartum programs, more than 200 on-demand videos, monthly challenges and easy-to-follow meal ideas and recipes.