Apple and Nike Instrument Workouts

Nike's new shoes incorporate sensors that communicate with Apple's iPod to display time, distance, and pace, as well as calories burned. Runners can review workout stats by run, or by week or month. www.apple.com/enews/2006/06/01enews1.html

 What s your use of contact vs. noncontact sensors?
What s your use of contact vs. noncontact sensors?