The 'Rex Timer' app takes an intelligent approach to interval timers to ensure that users can create customized workouts without needing to deal with preset functionalities. 'Rex Timer' works by enabling users to type in the kind of workout that they are partaking in to create a custom timer that will respond accordingly. This means a request such as "2min work, 30 sec rest, for 6 rounds." can be entered and the app will instantly go to work creating this timer series on its own.
The 'Rex Timer' app does away with all the confusion that can surround internal timers that should be relatively simple but can often be associated with frustration when the results are inaccurate.