check this out, tons of HIIT timers out there. i grew up wrestling and used to use a physical device called a gymboss which was awesome at the time. they have n

check this out, tons of HIIT timers out there. i grew up wrestling and used to use a physical device called a gymboss which was awesome at the time. they have now made Android and iOS apps https://itunes.apple.com/us/app/gymboss-2-interval-timer/id500887448?mt=8 https://itunes.apple.com/us/app/gymboss-2-interval-timer/id5... https://play.google.com/store/apps/details?id=com.halcyoni.gymboss2&hl=en https://play.google.com/store/apps/details?id=com.halcyoni.g...