Just before you crest a hill or reach the end of a speed interval, your lungs go into overdrive.

Incorporating speed work or interval training (running at a very fast speed for short intervals of time) into your running routine can also help your weight loss efforts.

Depending upon your processor and the speed at which it operates, your mileage may vary, but the API does offer a way to schedule time-outs below the jiffies tick interval.