Fit Smart, a new fitness tracker from Adidas, is taking a different approach to the Quantified Self. Instead of measuring all of your activity 24/7, Fit Smart is only worn when you’re exercising or doing something physical that you want to quantify – think of it more like a personal trainer than a fitness tracker. The tracker puts heart rate technology on your wrist, but can also calculate how many calories you’ve burned, how fast you’re going, how far you’ve moved, and more. It also lets you quickly tell how hard you’re working through its LED lights, which range from a relaxed blue to an intense red. To make sure you get the most out of your workout, Fit Smart first gauges your stamina and level of fitness, then sends that info to the companion Adidas MiCoach app to generate training plans for a variety of workouts. If you want to take your training to the next level – and want more than a step and calorie tracker – the Adidas Fit Smart launches in August for $199.