All my customized exercises (the ones I added myself, not the preset exercises) can only be set to an interval between 5 mins and 12 hrs. Who needs an interval of 5 mins when you're doing HIIT? Every time I try to set it to let's say 30 secs, the app tells me to "Enter number between 5 mins and 12 hrs" and the timer won't go lower than 5 mins. Has anyone successfully customized their interval training without this restriction?