On Board Online • March 7, 2016 • Heart Monitors • Technology

By Jason Franchuk
Special Correspondent

A timid face greeted teacher Doug Hallberg near the end of a physical education class in the Mohonasen school district. A delightful problem: a seventh-grade girl was wondering if she had been working too hard.

Sheepishly, she handed over a slimy heart rate monitor.

"It's supposed to be sweaty ? that's the point!" Hallberg replied in a cheerful, booming voice.