For Lifeguard I did 3 iterations of prototype testing in 3 weeks, to make their ideas for the second NRGY app tangible and elicit user needs to come up with a design that fit the criteria of both Lifeguard, their client and the user needs. The first prototype was based on the briefing and experience of Lifeguard and the criteria of the client. The second and third prototype were improved versions ofh the concept, based on usability and experience testing with a clickable prototype. The fast iterations gave a lot of insights on the concept and created empathy with the users, to be able to come up with the best user experience and reaching the goal of what the app was made for. The prototype was used as first steps for further development of the app.