This is one of my favorite apps to use for any HIIT (High Intensity Interval Training), Tabata, Circuit Training, and more. It’s called the Seconds Pro App and can be easily downloaded from the Apps Store right to your iPhone, iPad and more. Aside from a Gymboss, this provides a whole new experience to your workout. Just plug in your exercises, timings, intervals, music and viola. For me personally, using timers like these keep me 100% committed to performing at the highest intensity. Additionally, unlike counting reps, timing my intervals makes me competitive and accountable to perform even harder. It forces me to keep pushing until “3.2.1…[rest]”.