Interval training is a great way to stay fit. You are going to need a decent timer to keep you on track. The Gymboss Charge Interval Timer has a built-in stopwatch and clock. It comes with chime and vibration interval notification. It has a backlit LCD display, so you can easily see the time in darker rooms.
The Gymboss Charge can time one or two intervals between 2 to 99 minutes. You can wear it like a watch comfortably. Its rechargeable battery lasts for months on a single charge.