I've always relied on the clock app on my phone or a stop watch for timed sets, but an interval timer like this one from Gymboss is so much easier to use. It can set on the floor or clip onto your waistband.
I have used it both ways and although I am not doing running intervals, it has remained clipped to my shorts during transition moves.
It was simple to set up and the screen is easy to read if you choose to take a peek at it during your workout. Otherwise you just wait for the beep to alert you that your set is over.
I have used the Gymboss during a variety of workouts:
It is also a great tool when you are working out with a partner because the alert beep can be easily heard by both of you.
I'm really looking forward to trying the Gymboss during my interval runs when I am cleared to lace up my running shoes again.
Disclaimer: I was sent a complimentary Gymboss for review purposes. All opinions expressed are 100% my own.