Images for Mobile App of a fitness startup

I am looking for professional images to be used for a mobile app that I am developing for a fitness startup. The focus of the images should be on a healthy lifestyle - which includes fitness exercises, nutrition tips and other healthy activities. The images should feature people as well. If it's possible, I'd like to use real human models in a studio environment. The goal is to create an aesthetically pleasing visual experience that inspires our users.