![slide_5[1]](https://imagedelivery.net/_jGo7Cp8DLHLbI9FzBn6-Q/the5krunner.com/2015/07/slide_51.jpg/w=9999)
Cool idea!
I’d buy some.
https://www.youtube.com/watch?v=QYApHUXGpO0&feature=player_detailpage
Last Updated on 13 January 2026 by the5krunner
tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.
I need these!!! Awesome invention. Why didn’t I think of this???