To logout of your account on your mobile device, you must first click the More button in the bottom right hand corner of your screen. (See image below.)
Once you are on the More screen, scroll to the very bottom and there will be a category labeled Logout, click this button. (See image below.)
A new screen will appear confirming that you want to logout. Click Confirm to continue the process. After this you will be logged out and back at the Sign In page for fitness coaches and for clients.