Most people are aware that sports have been around for centuries, at least as early as 776 BC when the ancient Greeks held the first Olympics. Since then, many of those original competitions (racing, jumping, throwing, lifting, etc.) remain and enthuse the masses, while more popular team and individual sports have also garnered global appeal. Nowadays, sports constitute a massive industry with dozens of ancillary branches.

As athletes have grown in number and caliber, so too has coaching. Coaching extends into fitness and overall lifestyle habits, including diet and nutrition. With the increased desire for excellence and assistance, coaches are now in high demand. Fortunately for those looking to find the right coach, there are plenty of websites and apps that provide helpful information for making an informed decision. One of the more anticipated among these is the new app Future, which launched last week, according to an article from Tech Crunch.

Story author Josh Constine outlined the features and cost of the app, writing:

The only way to beat laziness is with guilt, so that’s what Future sells. It assigns you an actual human trainer who builds personalized workout plans and messages you throughout the day to make sure you’re doing them. It even gives you an Apple Watch to track your activity and ensure you’re not lying. Future actually got me to the gym where my coach kicked my ass remotely with a 30-minute lifting routine I’d never have stuck to by myself.

The catch? It’s probably the most expensive app you’ve ever seen, charging $150 per month.

Future officially launches today. Luckily it comes with a one-month money-back guarantee that CEO Rishi Mandal says has only been redeemed once. It’s produced some stunning stats from its beta tests: 95% of users stuck with it for three months, and 85% kept training for six months. That’s unheard of in fitness tech.

The remarkable retention and Future’s potential to become a gateway for your exercise and nutrition spending have roped in some big-name investors. Today it’s announcing an $8.5 million Series A led by Kleiner Perkins with partner Mamoon Hamid joining the board, building on its $3 million seed. Other backers include Instagram co-founder Mike Krieger, Khosla Ventures, Founders Fund and Caffeinated Capital. Athletes are betting on Future’s promise of democratizing the personal training they get, including Golden State Warrior Sean Livingston, and NFL stars Ndamukong Suh and Kelvin Beachum.

Perhaps no one understands the importance of coaching better than professional athletes, so the support from Livingston, Suh and Beachum carries a lot of weight—and not just because those are large men!

To read Constine’s full writeup, click here.