Resting in between exercise sets is necessary to increase muscular endurance during a workout which allows you to accomplish more before exhaustion. Fitbod's rest timer allows you to keep track and stay focused in between each set of your workout. Once you log in a set, the countdown rest timer will start and a tone and/or vibration will emit when it’s time for your next set.
Not sure how much time is needed in between each set? When activated, Fitbod's rest timer displays the proper rest period in between sets for any given exercise. The rest timer can be activated in any given exercise by switching the timer icon from OFF to ON. The rest timer icon can be found within the exercise details next to the # of sets display (directly under the exercise title).
You can also adjust the rest timer (incrementing or decrementing 15 seconds) to fit your capabilities by selecting "REST (time)" in pre-workout screen or when rest timer has started when workout is in progress. Adjusting the rest timer in pre-workout screen will adjust for all rest timers for the exercise. During a workout in progress, rest timers cannot be edited until rest timer has started which adjustment only affect current timer and NOT all rest timers for the exercise.
For additional reference, please see images below:
Rest timer - ON (Pre-Workout)
Rest Timer Adjustment (Pre-Workout)
Rest timers are only for a singular exercise for a singular workout. They are generated depending on the difficulty of the lift so rest time for an exercise today won't be the same rest as the next time you perform the same exercise. Therefore changing the rest time will only persist for that workout.