Step 1: I approached this brief with the view that this app can be useful for males and females of any age, but mostly within their late teens - 40's. I started out by creating a moodboard of inspirational designs, functionality, colours and images.
View the board here: https://projects.invisionapp.com/boards/6334699D7E5WG/
Step 2: Branding. I'm not a brand designer so I took a simplistic approach with the clever idea of basing the app around a personal trainer called "Arnold". Ring a bell? ;) I picked a colour palette that was vibrant and inspired getting out and being active.
Step 3: UI design. I then took my idea to Photoshop. Where I created a few pages to represent the key functionality of the app, a chat bot. Followed by a couple of other screens to show where the app could potentially venture to.
For this particular brief I didn't feel the need to wire any of the below screens. As the app's complexity evolves and new pages such as the dashboard are created UX invovlment will be crucial.