Fitstar and its iPad personal-trainer app has raised $4 million in a Series A funding round led by Trinity Ventures.

FitStar debuted in early June with video-based fitness application FitStar: Tony Gonzalez. The future Pro Football Hall of Fame tight end works out participants with a customizable program and interactive workout that features the NFL star as your personal trainer.

“We’re focused on building engaging and inspiring health experiences, and this new round of financing will help us accelerate the release of new products that we are confident will delight our customers,” FitStar CEO Mike Maser said in a statement.

The application has garnered positive reviews and popularity. After just two weeks, the app is already in 145 countries, and “FitStars,” the application’s users, have burned over four million calories and counting (or so the company claims).

FitStar’s programs are customized-based on each person’s goals, and you can tailor the workouts to your experience level: from workout newbie to fitness buff. Similar to other fitness applications, FitStar can connect with your social networks to share your achievements and drive motivation from your friends to you.

Early investors such as Google Ventures participated in the $4 million financing round as well as Advancit Capital and Floodgate Fund. The funding will help FitStar grow their team and build their platform and product roadmap.

FitStar: Tony Gonzalez is the first in a line of upcoming applications that will have a variety of workouts led by fitness experts and inspirational personalities.

The San Francisco-based startup was founded in 2012 and has raised a total of $5 million in two rounds of funding.

Image source: FitStar